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Revert of Cast: Re-factor rtcp_sender.cc into rtcp_builder.cc and do some cleanup (patchset #3 id:40001 of https://codereview.chromium.org/513313004/)

Reason for revert:
Caused cast_unittest rtcp test failures on Linux Asan Lsan builders (memory leaks).

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/7132

Original issue's description:
> Cast: Re-factor rtcp_sender.cc into rtcp_builder.cc and do some cleanup
>
> Committed: https://chromium.googlesource.com/chromium/src/+/6217e450d9e75037c62fff773c94aebe7f3ed2e6

TBR=miu@chromium.org,hubbe@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/541293004

Cr-Commit-Position: refs/heads/master@{#293665}