Revert of Only compare sequence numbers from the same SSRC in ForwardErrorCorrection. (patchset #5 id:120001 of https://codereview.webrtc.org/2893293003/ )

Reason for revert:
Breaks fuzzer.

Original issue's description:
> Only compare sequence numbers from the same SSRC in ForwardErrorCorrection.
>
> Prior to this CL, the ForwardErrorCorrection state would be reset whenever
> the difference in sequence numbers of the last recovered media packet
> and the new packet (media or FEC) was too large. This comparison did not
> take into account that FlexFEC uses a different SSRC for the FEC packets,
> meaning that the the state would be reset very frequently when FlexFEC
> is used. This should not have led to any major problems, except for a
> decreased decoding efficiency.
>
> This CL verifies that whenever we compare sequence numbers in
> ForwardErrorCorrection, they do indeed belong to the same SSRC.
>
> BUG=webrtc:5654
>
> Review-Url: https://codereview.webrtc.org/2893293003
> Cr-Commit-Position: refs/heads/master@{#18399}
> Committed: https://chromium.googlesource.com/external/webrtc/+/1476a9d789db03457595cf7dbea7e362972f2a4d

TBR=stefan@webrtc.org,holmer@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2919313005
Cr-Commit-Position: refs/heads/master@{#18446}
7 files changed
tree: 53003609f0806e34981120b4f3fab8be24bc020d
  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