Revert of Trace the stats report as JSON instead of each stat separately. (patchset #3 id:100001 of https://codereview.webrtc.org/2986453002/ )

Reason for revert:
It breaks a downstream project.

Original issue's description:
> Trace the stats report as JSON instead of each stat separately.
>
> Trace the whole report as a string instead of each field on it's own. And test that the traces collected are valid.
>
> R=tommi@webrtc.org, hbos@webrtc.org
> BUG=chromium:653087
>
> Review-Url: https://codereview.webrtc.org/2986453002
> Cr-Commit-Position: refs/heads/master@{#19341}
> Committed: https://chromium.googlesource.com/external/webrtc/+/80c65780e618f90369295fe5daf8075e9b374c26

TBR=hbos@webrtc.org,tommi@webrtc.org,ehmaldonado@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:653087

Review-Url: https://codereview.webrtc.org/3001683002
Cr-Commit-Position: refs/heads/master@{#19344}
2 files changed
tree: 3168425f4df6fd1517dada7d1cbbb7c76b430427
  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. CODE_OF_CONDUCT.md
  16. codereview.settings
  17. DEPS
  18. LICENSE
  19. license_template.txt
  20. LICENSE_THIRD_PARTY
  21. OWNERS
  22. PATENTS
  23. PRESUBMIT.py
  24. pylintrc
  25. README.md
  26. 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