Revert of Moving MediaStreamSignaling logic into PeerConnection. (patchset #10 id:180001 of https://codereview.webrtc.org/1393563002/ )

Reason for revert:
Broke browser_tests on Mac. Still need to investigate the cause.

Original issue's description:
> Moving MediaStreamSignaling logic into PeerConnection.
>
> This needs to happen because in the future, m-lines will be offered
> based on the set of RtpSenders/RtpReceivers, rather than the set of
> tracks that MediaStreamSignaling knows about.
>
> Besides that, MediaStreamSignaling was a "glue class" without
> a clearly defined role, so it going away is good for other
> reasons as well.
>
> Committed: https://crrev.com/97c392935411398b506861601c82e31d95c591f0
> Cr-Commit-Position: refs/heads/master@{#10268}

TBR=pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.webrtc.org/1403633005

Cr-Commit-Position: refs/heads/master@{#10269}
23 files changed
tree: 56a766ed7a9d289017588e1cd3525857227171a4
  1. .clang-format
  2. .gitignore
  3. .gn
  4. AUTHORS
  5. BUILD.gn
  6. COPYING
  7. DEPS
  8. LICENSE
  9. LICENSE_THIRD_PARTY
  10. OWNERS
  11. PATENTS
  12. PRESUBMIT.py
  13. README.md
  14. WATCHLISTS
  15. all.gyp
  16. check_root_dir.py
  17. chromium/
  18. codereview.settings
  19. data/
  20. infra/
  21. license_template.txt
  22. pylintrc
  23. resources/
  24. setup_links.py
  25. sync_chromium.py
  26. talk/
  27. third_party/
  28. tools/
  29. webrtc/
README.md

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More info