Taylor Brandstetter 58f2bd90f1 Fixing the interaction between codec bitrate limit and "b=AS".
This fixes a problem where "b=AS" and "x-google-start-bitrate" can't
be used together. It also starts taking the minimum of "b=AS" and
"x-google-max-bitrate", instead of just letting "b=AS" win.

BUG=webrtc:5811
R=pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1904063003 .

Cr-Commit-Position: refs/heads/master@{#12519}
2016-04-27 00:15:35 +00:00
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