Revert of GN: Enable ARC for Mac and iOS in rtc_* templates (patchset #3 id:40001 of https://codereview.webrtc.org/2781713004/ )

Reason for revert:
Breaks mac build

Original issue's description:
> GN: Enable ARC for Mac and iOS in rtc_* templates
>
> Remove all uses of retain/release and NSAutoreleasePool.
>
> This makes transformation to Bazel easier.
>
> This CL subsumes https://codereview.webrtc.org/2778163002 and depends on https://codereview.webrtc.org/2784483002/
>
> BUG=webrtc:6412
>
> Review-Url: https://codereview.webrtc.org/2781713004
> Cr-Commit-Position: refs/heads/master@{#17780}
> Committed: https://chromium.googlesource.com/external/webrtc/+/6bda02b51dc00401d2a0d04be996ed10e5acac47

TBR=kjellander@webrtc.org,magjed@webrtc.org,stefan@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6412

Review-Url: https://codereview.webrtc.org/2827223003
Cr-Commit-Position: refs/heads/master@{#17784}
9 files changed
tree: e5197d77ee9154336f23b69596c37c84ba00a4b2
  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