Reland of Enable GN check for webrtc/base

Reland of Enable GN check for webrtc/base (patchset #3 id:230001 of https://codereview.webrtc.org/2838683002/ )

Reason for revert:
Try to fix the webrtc/test/fuzzers issue and reland this CL because it 
contains lots of fixes for our BUILD.gn files.

Original issue's description:
> Revert of Enable GN check for webrtc/base (patchset #13 id:240001 of https://codereview.webrtc.org/2717083002/ )
> 
> Reason for revert:
> Breaks Chromium because in Chromium we import WebRTC with rtc_include_tests=false (https://bugs.chromium.org/p/chromium/issues/detail?id=713179#c6).
> 
> Chromium uses webrtc/test/fuzzers and this CL adds test dependencies to neteq_rtc_fuzzer.
> 
> Original issue's description:
> > Enable GN check for webrtc/base
> > 
> > It's not possible to enable it for the rtc_base_approved
> > target but since a larger refactoring is ongoing for webrtc/base
> > this CL doesn't attempt to fix that.
> > 
> > Changes made:
> > * Move webrtc/system_wrappers/include/stringize_macros.h into 
> >   webrtc/base:rtc_base_approved_unittests (and corresponding
> >   unit test to rtc_base_approved_unittests).
> > * Move md5digest.* from rtc_base_approved to rtc_base_test_utils target.
> > * Move webrtc/system_wrappers/include/stringize_macros.h (+test) into
> >   webrtc/base.
> > * Remove unused use include of webrtc/base/fileutils.h in 
> >   webrtc/base/pathutils.cc
> > 
> > BUG=webrtc:6828, webrtc:3806, webrtc:7480
> > NOTRY=True
> > 
> > Review-Url: https://codereview.webrtc.org/2717083002
> > Cr-Commit-Position: refs/heads/master@{#17766}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/ed754e71ae8866db641677073274e86fe704eeac
> 
> TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:6828, webrtc:3806, webrtc:7480
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2838683002
> Cr-Commit-Position: refs/heads/master@{#17849}
> Committed: https://chromium.googlesource.com/external/webrtc/+/11ed366c487a938815cd52ad2ab5467b0f90e1ae

TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6828, webrtc:3806, webrtc:7480
Review-Url: https://codereview.webrtc.org/2840453004
Cr-Commit-Position: refs/heads/master@{#17876}
Committed: https://chromium.googlesource.com/external/webrtc/+/7054085e59c3123613cd0014bedb0fe91a56e26f

[mbonadei, 2017-04-25 06:49:08]

Created Reland of Enable GN check for webrtc/base

[kjellander_webrtc, 2017-04-26 07:23:09]

lgtm

[tommi, 2017-04-26 07:27:58]

The CQ bit was checked by tommi@webrtc.org

[tommi, 2017-04-26 07:27:59]

lgtm

[commit-bot: I haz the power, 2017-04-26 07:28:04]

CQ is trying da patch.

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

[tommi, 2017-04-26 07:28:07]

The CQ bit was unchecked by tommi@webrtc.org

[commit-bot: I haz the power, 2017-04-26 07:28:09]

CQ is committing da patch.

Bot data: {"patchset_id": 350001, "attempt_start_ts": 1493191678810070,
"parent_rev": "dbb1be59ff12176ee4ec0c5ab4a0693748a1fc06", "commit_rev":
"7054085e59c3123613cd0014bedb0fe91a56e26f"}

[commit-bot: I haz the power, 2017-04-26 07:28:13]

Description was changed from

==========
Reland of Enable GN check for webrtc/base (patchset #3 id:230001 of
https://codereview.webrtc.org/2838683002/ )

Reason for revert:
Try to fix the webrtc/test/fuzzers issue and reland this CL because it 
contains lots of fixes for our BUILD.gn files.

Original issue's description:
> Revert of Enable GN check for webrtc/base (patchset #13 id:240001 of
https://codereview.webrtc.org/2717083002/ )
> 
> Reason for revert:
> Breaks Chromium because in Chromium we import WebRTC with
rtc_include_tests=false
(https://bugs.chromium.org/p/chromium/issues/detail?id=713179#c6).
> 
> Chromium uses webrtc/test/fuzzers and this CL adds test dependencies to
neteq_rtc_fuzzer.
> 
> Original issue's description:
> > Enable GN check for webrtc/base
> > 
> > It's not possible to enable it for the rtc_base_approved
> > target but since a larger refactoring is ongoing for webrtc/base
> > this CL doesn't attempt to fix that.
> > 
> > Changes made:
> > * Move webrtc/system_wrappers/include/stringize_macros.h into 
> >   webrtc/base:rtc_base_approved_unittests (and corresponding
> >   unit test to rtc_base_approved_unittests).
> > * Move md5digest.* from rtc_base_approved to rtc_base_test_utils target.
> > * Move webrtc/system_wrappers/include/stringize_macros.h (+test) into
> >   webrtc/base.
> > * Remove unused use include of webrtc/base/fileutils.h in 
> >   webrtc/base/pathutils.cc
> > 
> > BUG=webrtc:6828, webrtc:3806, webrtc:7480
> > NOTRY=True
> > 
> > Review-Url: https://codereview.webrtc.org/2717083002
> > Cr-Commit-Position: refs/heads/master@{#17766}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/ed754e71ae8866db641677073...
> 
> TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:6828, webrtc:3806, webrtc:7480
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2838683002
> Cr-Commit-Position: refs/heads/master@{#17849}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/11ed366c487a938815cd52ad2...

TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6828, webrtc:3806, webrtc:7480
==========

to

==========
Reland of Enable GN check for webrtc/base (patchset #3 id:230001 of
https://codereview.webrtc.org/2838683002/ )

Reason for revert:
Try to fix the webrtc/test/fuzzers issue and reland this CL because it 
contains lots of fixes for our BUILD.gn files.

Original issue's description:
> Revert of Enable GN check for webrtc/base (patchset #13 id:240001 of
https://codereview.webrtc.org/2717083002/ )
> 
> Reason for revert:
> Breaks Chromium because in Chromium we import WebRTC with
rtc_include_tests=false
(https://bugs.chromium.org/p/chromium/issues/detail?id=713179#c6).
> 
> Chromium uses webrtc/test/fuzzers and this CL adds test dependencies to
neteq_rtc_fuzzer.
> 
> Original issue's description:
> > Enable GN check for webrtc/base
> > 
> > It's not possible to enable it for the rtc_base_approved
> > target but since a larger refactoring is ongoing for webrtc/base
> > this CL doesn't attempt to fix that.
> > 
> > Changes made:
> > * Move webrtc/system_wrappers/include/stringize_macros.h into 
> >   webrtc/base:rtc_base_approved_unittests (and corresponding
> >   unit test to rtc_base_approved_unittests).
> > * Move md5digest.* from rtc_base_approved to rtc_base_test_utils target.
> > * Move webrtc/system_wrappers/include/stringize_macros.h (+test) into
> >   webrtc/base.
> > * Remove unused use include of webrtc/base/fileutils.h in 
> >   webrtc/base/pathutils.cc
> > 
> > BUG=webrtc:6828, webrtc:3806, webrtc:7480
> > NOTRY=True
> > 
> > Review-Url: https://codereview.webrtc.org/2717083002
> > Cr-Commit-Position: refs/heads/master@{#17766}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/ed754e71ae8866db641677073...
> 
> TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:6828, webrtc:3806, webrtc:7480
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2838683002
> Cr-Commit-Position: refs/heads/master@{#17849}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/11ed366c487a938815cd52ad2...

TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6828, webrtc:3806, webrtc:7480

Review-Url: https://codereview.webrtc.org/2840453004
Cr-Commit-Position: refs/heads/master@{#17876}
Committed:
https://chromium.googlesource.com/external/webrtc/+/7054085e59c3123613cd0014b...
==========

[commit-bot: I haz the power, 2017-04-26 07:28:14]

Committed patchset #9 (id:350001) as
https://chromium.googlesource.com/external/webrtc/+/7054085e59c3123613cd0014b...

[mbonadei, 2017-04-26 07:38:31]

A revert of this CL (patchset #9 id:350001) has been created in
https://codereview.webrtc.org/2846483002/ by mbonadei@webrtc.org.

The reason for reverting is: It causes a Chromium build error:

ERROR at //third_party/webrtc/test/BUILD.gn:113:5: Can't load input file.
    "//third_party/gflags",.