Revert of iOS: Use JSON for GN configuration instead of MB + remove symbols (patchset #4 id:80001 of https://codereview.webrtc.org/2688103002/ )

Reason for revert:
Something is different from trybots vs the commit bots, causing it to fail when running GN:
https://build.chromium.org/p/client.webrtc/builders/iOS32%20Release/builds/10151

Original issue's description:
> iOS: Use JSON for GN configuration instead of MB + remove symbols.
>
> This aligns with how the ios recipe module is used in Chromium.
> It should prevent breakages like one we had recently.
>
> It also means we're no longer setting symbol_level=1 explicitly.
> The default is 0 (no symbols), which is now what's being used.
>
> Also move all the directories containing JSON files into
> tools-webrtc/ios/bots to make it clearer (and more similar to
> Chromium).
>
> BUG=webrtc:7140, webrtc:7161
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2688103002
> Cr-Commit-Position: refs/heads/master@{#16633}
> Committed: https://chromium.googlesource.com/external/webrtc/+/73f01de4edda30c419bf6daf8b91d2a0d28c06a9

TBR=ehmaldonado@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7140, webrtc:7161

Review-Url: https://codereview.webrtc.org/2694423002
Cr-Commit-Position: refs/heads/master@{#16634}
17 files changed
tree: 191fa3a779eb00455985c09a567e41c855099041
  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. This page is maintained by the Google Chrome team.

Development

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

More info