GitLab

Identical logic change in both AudioSender and VideoSender: Send a sender
report just before each frame, up to the first 100 frames.  Then, they are
sent at ~1 second intervals thereafter.  However, if a receiver report
shows up, we halt the aggressive report sending immediately since we know
the data dependency (receiver side) has been satisfied.

Also, misc clean-ups:

1. RtpTimestampHelper threw away significant precision in its calculations
   (was truncating to millis).
2. Unit tests were using EXPECT with args in the wrong order (per gtest
   requirements).
3. Got rid of useless LocalRtcpXXXXXSenderFeedback class.

BUG=371482

Review URL: https://codereview.chromium.org/295603004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272732 0039d316-1c4b-4281-b951-d872f2087c98