update MOCK_METHODs to use new syntax recommended in go/totw/164
Replace fixture with struct of mocks.
Use main method under test (IncomingPacket) directly rather than through fixture helpers
minor cleanup of the RtcReceiver itself:
make IncomingPacket function more friendly to containers,
mark class as final to verify ability to inherit from it is not used and
thus destructor doesn't need to be virtual.
Bug: None
Change-Id: I346e7dc513b1fbe663ebe5858dec7df0520416a7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/170226
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30765}
443f26695f