magjed b05fa2466a Optimize FindCodecById and ReferencedCodecsMatch
These functions currently copy cricket::Codec classes by value which is
expensive since they contain e.g. std::map<std::string, std::string>
containers with parameters. This CL avoids copying them altogether.

BUG=webrtc:6337

Review-Url: https://codereview.webrtc.org/2493733003
Cr-Commit-Position: refs/heads/master@{#15040}
2016-11-11 12:00:20 +00:00
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