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}
11 files changed
tree: 4e23cb81b703a0f3f8b398a3a95b9c54f4c32c5f
  1. build_overrides/
  2. data/
  3. infra/
  4. resources/
  5. tools-webrtc/
  6. webrtc/
  7. .clang-format
  8. .git-blame-ignore-revs
  9. .gitignore
  10. .gn
  11. AUTHORS
  12. BUILD.gn
  13. check_root_dir.py
  14. cleanup_links.py
  15. codereview.settings
  16. DEPS
  17. LICENSE
  18. license_template.txt
  19. LICENSE_THIRD_PARTY
  20. OWNERS
  21. PATENTS
  22. PRESUBMIT.py
  23. pylintrc
  24. README.md
  25. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info