Reland of Delete empty API files and cleaned up includes.

Reland of Delete empty API files and cleaned up includes. (patchset #1 id:1 of https://codereview.webrtc.org/1813083002/ )

Reason for revert:
New attempt. Cl for removing videosourceinterface.h dep in chrome is landed here: https://codereview.chromium.org/1810273003/

Original issue's description:
> Revert of Delete empty API files and cleaned up includes. (patchset #2 id:20001 of https://codereview.webrtc.org/1809053002/ )
>
> Reason for revert:
> Breaks Chromium build. Need to remove the references to the obsolete header files from Chromium and reland.
>
> Original issue's description:
> > Delete empty API files and cleaned up includes.
> >
> > TBR=glaznev@webrtc.org
> >
> > BUG=webrtc:5426
> >
> > Committed: https://crrev.com/c9022f508644dc33c01b05cb22ebfc2be145d6b2
> > Cr-Commit-Position: refs/heads/master@{#12039}
>
> TBR=nisse@webrtc.org,glaznev@webrtc.org,perkj@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5426
>
> Committed: https://crrev.com/246b5273986d5a5b140b3d1a656baa8d40c36276
> Cr-Commit-Position: refs/heads/master@{#12042}

TBR=nisse@webrtc.org,glaznev@webrtc.org,deadbeef@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5426
Committed: https://crrev.com/9e083d2ac5989a96f071b16173d4bdec00010aca
Cr-Commit-Position: refs/heads/master@{#12065}

[perkj_webrtc, 2016-03-20 15:19:38]

Created Reland of Delete empty API files and cleaned up includes.

[commit-bot: I haz the power, 2016-03-20 15:19:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1819733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1819733002/1

[commit-bot: I haz the power, 2016-03-20 15:31:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1819733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1819733002/1

[commit-bot: I haz the power, 2016-03-20 16:01:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1819733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1819733002/1

[commit-bot: I haz the power, 2016-03-20 16:31:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1819733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1819733002/1

[commit-bot: I haz the power, 2016-03-20 16:38:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-20 16:38:51]

Description was changed from

==========
Reland of Delete empty API files and cleaned up includes. (patchset #1 id:1 of
https://codereview.webrtc.org/1813083002/ )

Reason for revert:
New attempt. Cl for removing videosourceinterface.h dep in chrome is landed
here: https://codereview.chromium.org/1810273003/

Original issue's description:
> Revert of Delete empty API files and cleaned up includes. (patchset #2
id:20001 of https://codereview.webrtc.org/1809053002/ )
> 
> Reason for revert:
> Breaks Chromium build. Need to remove the references to the obsolete header
files from Chromium and reland.
> 
> Original issue's description:
> > Delete empty API files and cleaned up includes.
> >
> > TBR=glaznev@webrtc.org
> >
> > BUG=webrtc:5426
> >
> > Committed: https://crrev.com/c9022f508644dc33c01b05cb22ebfc2be145d6b2
> > Cr-Commit-Position: refs/heads/master@{#12039}
> 
> TBR=nisse@webrtc.org,glaznev@webrtc.org,perkj@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5426
> 
> Committed: https://crrev.com/246b5273986d5a5b140b3d1a656baa8d40c36276
> Cr-Commit-Position: refs/heads/master@{#12042}

TBR=nisse@webrtc.org,glaznev@webrtc.org,deadbeef@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5426
==========

to

==========
Reland of Delete empty API files and cleaned up includes. (patchset #1 id:1 of
https://codereview.webrtc.org/1813083002/ )

Reason for revert:
New attempt. Cl for removing videosourceinterface.h dep in chrome is landed
here: https://codereview.chromium.org/1810273003/

Original issue's description:
> Revert of Delete empty API files and cleaned up includes. (patchset #2
id:20001 of https://codereview.webrtc.org/1809053002/ )
>
> Reason for revert:
> Breaks Chromium build. Need to remove the references to the obsolete header
files from Chromium and reland.
>
> Original issue's description:
> > Delete empty API files and cleaned up includes.
> >
> > TBR=glaznev@webrtc.org
> >
> > BUG=webrtc:5426
> >
> > Committed: https://crrev.com/c9022f508644dc33c01b05cb22ebfc2be145d6b2
> > Cr-Commit-Position: refs/heads/master@{#12039}
>
> TBR=nisse@webrtc.org,glaznev@webrtc.org,perkj@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5426
>
> Committed: https://crrev.com/246b5273986d5a5b140b3d1a656baa8d40c36276
> Cr-Commit-Position: refs/heads/master@{#12042}

TBR=nisse@webrtc.org,glaznev@webrtc.org,deadbeef@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5426

Committed: https://crrev.com/9e083d2ac5989a96f071b16173d4bdec00010aca
Cr-Commit-Position: refs/heads/master@{#12065}
==========

[commit-bot: I haz the power, 2016-03-20 16:38:52]

Patchset 1 (id:??) landed as
https://crrev.com/9e083d2ac5989a96f071b16173d4bdec00010aca
Cr-Commit-Position: refs/heads/master@{#12065}