Revert of Added GetCpuTime to base/ to get total CPU time consumed by process for perf tests. (patchset #24 id:440001 of https://codereview.webrtc.org/2695743003/ )

Reason for revert:
The GetThreadCpuTimeTest.SingleThread and .TwoThreads tests are unfortunately flaky on Mac (maybe other platforms).  See for example:

https://build.chromium.org/p/client.webrtc/builders/Mac%20Asan/builds/11271/steps/rtc_unittests%20on%20Mac-10.11/logs/stdio

https://build.chromium.org/p/client.webrtc/builders/Mac64%20Debug/builds/10395/steps/rtc_unittests%20on%20Mac-10.11/logs/stdio

https://build.chromium.org/p/client.webrtc/builders/Mac%20Asan/builds/11271/steps/rtc_unittests%20on%20Mac-10.11/logs/stdio

Since it's late, I'll have to revert the CL to get the tree and trybots green (instead of only disabling the failing tests).

Original issue's description:
> Added GetCpuTime to base/ to get total CPU time consumed by process for perf tests.
>
> BUG=webrtc:7095
>
> Review-Url: https://codereview.webrtc.org/2695743003
> Cr-Commit-Position: refs/heads/master@{#16665}
> Committed: https://chromium.googlesource.com/external/webrtc/+/3ff474b72ba1b34027e8391b1014c2838af445d4

TBR=sprang@webrtc.org,mflodman@webrtc.org,deadbeef@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org,ilnik@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7095

Review-Url: https://codereview.webrtc.org/2698333004
Cr-Commit-Position: refs/heads/master@{#16679}
4 files changed
tree: 5dfe259a15069751cd19029bf07e1f77a3364cff
  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