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This CL is a preparation step to being able to move this file to Blink,
and then removing the whole directory.

Basically:

- it removes WebRtcAudioRendererTest inheritance to AudioDeviceFactory,
since it is used solely to override AudioDeviceFactory::CreateAudioRendererSink().

Instead of the explicit override, which is called by explicitly by
AudioDeviceFactoryTestingPlatformSupport::NewAudioRendererSink(), the CL just
creates the needed media::AudioRendererSink instance directly in
AudioDeviceFactoryTestingPlatformSupport::NewAudioRendererSink() and return it.

- the rest of the CL adapts expectation checks related to
WebRtcAudioRendererTest::MockCreateAudioRendererSink() with using
AudioDeviceFactoryTestingPlatformSupport::MockNewAudioRendererSink() and some
gtest tricks (eg testing::SaveArgs<>, and testing::InvokeWithoutArgs).
This way all original checks are kept!

R=guidou@chromium.org

Change-Id: If517cb2ea413359bcd80ca3e25e3d91b1e3a12ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888555
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712294}