Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu std::unique_ptr.

Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2576673002/ )

Reason for revert:
Downstream project fixed to not make copies while iterating over the stats mapping.

Original issue's description:
> Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2567143003/ )
>
> Reason for revert:
> The change from rtc::linked_ptr to std::unique_ptr broke a downstream project.
>
> Original issue's description:
> > Delete rtc::linked_ptr. Only use, in statstypes.h, replaced with std::unique_ptr.
> >
> > BUG=webrtc:6424
> >
> > Committed: https://crrev.com/36f74e55792cae19db8b222c29aa38d6e0eb1225
> > Cr-Commit-Position: refs/heads/master@{#15588}
>
> TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6424
>
> Committed: https://crrev.com/8afbc8cba65d99bb7a0feece8fb3055b144106b1
> Cr-Commit-Position: refs/heads/master@{#15589}

TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6424
Committed: https://crrev.com/06035cf53abad80b0525f286a3b81e388cc7ee00
Cr-Commit-Position: refs/heads/master@{#15627}

[nisse-webrtc, 2016-12-15 10:17:18]

Created Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr.

[nisse-webrtc, 2016-12-15 10:26:25]

The CQ bit was checked by nisse@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-15 10:26:33]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-12-15 10:44:18]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-15 10:44:19]

Dry run: This issue passed the CQ dry run.

[hta-webrtc, 2016-12-15 10:51:38]

lgtm

[nisse-webrtc, 2016-12-15 11:10:28]

The CQ bit was checked by nisse@webrtc.org

[commit-bot: I haz the power, 2016-12-15 11:10:36]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-12-15 11:12:14]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481800228842180, "parent_rev":
"1169c730a267e08049577c821939e3594dc7606c", "commit_rev":
"77a90237af3c11ba62a1efa1ed3164b72326784b"}

[commit-bot: I haz the power, 2016-12-15 11:12:17]

Description was changed from

==========
Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2576673002/
)

Reason for revert:
Downstream project fixed to not make copies while iterating over the stats
mapping.

Original issue's description:
> Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2567143003/
)
> 
> Reason for revert:
> The change from rtc::linked_ptr to std::unique_ptr broke a downstream project.
> 
> Original issue's description:
> > Delete rtc::linked_ptr. Only use, in statstypes.h, replaced with
std::unique_ptr.
> >
> > BUG=webrtc:6424
> >
> > Committed: https://crrev.com/36f74e55792cae19db8b222c29aa38d6e0eb1225
> > Cr-Commit-Position: refs/heads/master@{#15588}
> 
> TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6424
> 
> Committed: https://crrev.com/8afbc8cba65d99bb7a0feece8fb3055b144106b1
> Cr-Commit-Position: refs/heads/master@{#15589}

TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6424
==========

to

==========
Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2576673002/
)

Reason for revert:
Downstream project fixed to not make copies while iterating over the stats
mapping.

Original issue's description:
> Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2567143003/
)
> 
> Reason for revert:
> The change from rtc::linked_ptr to std::unique_ptr broke a downstream project.
> 
> Original issue's description:
> > Delete rtc::linked_ptr. Only use, in statstypes.h, replaced with
std::unique_ptr.
> >
> > BUG=webrtc:6424
> >
> > Committed: https://crrev.com/36f74e55792cae19db8b222c29aa38d6e0eb1225
> > Cr-Commit-Position: refs/heads/master@{#15588}
> 
> TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6424
> 
> Committed: https://crrev.com/8afbc8cba65d99bb7a0feece8fb3055b144106b1
> Cr-Commit-Position: refs/heads/master@{#15589}

TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6424

Review-Url: https://codereview.webrtc.org/2581663002
==========

[commit-bot: I haz the power, 2016-12-15 11:12:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-15 11:12:28]

Description was changed from

==========
Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2576673002/
)

Reason for revert:
Downstream project fixed to not make copies while iterating over the stats
mapping.

Original issue's description:
> Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2567143003/
)
> 
> Reason for revert:
> The change from rtc::linked_ptr to std::unique_ptr broke a downstream project.
> 
> Original issue's description:
> > Delete rtc::linked_ptr. Only use, in statstypes.h, replaced with
std::unique_ptr.
> >
> > BUG=webrtc:6424
> >
> > Committed: https://crrev.com/36f74e55792cae19db8b222c29aa38d6e0eb1225
> > Cr-Commit-Position: refs/heads/master@{#15588}
> 
> TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6424
> 
> Committed: https://crrev.com/8afbc8cba65d99bb7a0feece8fb3055b144106b1
> Cr-Commit-Position: refs/heads/master@{#15589}

TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6424

Review-Url: https://codereview.webrtc.org/2581663002
==========

to

==========
Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2576673002/
)

Reason for revert:
Downstream project fixed to not make copies while iterating over the stats
mapping.

Original issue's description:
> Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu
std::unique_ptr. (patchset #1 id:1 of https://codereview.webrtc.org/2567143003/
)
>
> Reason for revert:
> The change from rtc::linked_ptr to std::unique_ptr broke a downstream project.
>
> Original issue's description:
> > Delete rtc::linked_ptr. Only use, in statstypes.h, replaced with
std::unique_ptr.
> >
> > BUG=webrtc:6424
> >
> > Committed: https://crrev.com/36f74e55792cae19db8b222c29aa38d6e0eb1225
> > Cr-Commit-Position: refs/heads/master@{#15588}
>
> TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6424
>
> Committed: https://crrev.com/8afbc8cba65d99bb7a0feece8fb3055b144106b1
> Cr-Commit-Position: refs/heads/master@{#15589}

TBR=solenberg@webrtc.org,pthatcher@webrtc.org,hta@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6424

Committed: https://crrev.com/06035cf53abad80b0525f286a3b81e388cc7ee00
Cr-Commit-Position: refs/heads/master@{#15627}
==========

[commit-bot: I haz the power, 2016-12-15 11:12:29]

Patchset 1 (id:??) landed as
https://crrev.com/06035cf53abad80b0525f286a3b81e388cc7ee00
Cr-Commit-Position: refs/heads/master@{#15627}

[nisse-webrtc, 2016-12-15 11:54:37]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2579753002/ by nisse@webrtc.org.

The reason for reverting is: This change broke Chrome too. It's stats processing
wants to make a copy of webrtc's stats mapping, which is no longer possible with
std::unique_ptr..