GitLab

Some cleanup in PipelineTest.

Do not call Pipeline::On{Audio|Video}RendererEnded() because it's pipeline's
implementation detail and will go away. Instead, let the mock renderers call the
ended_cb.

Also rename several helper functions to reflect what they really do.

BUG=392259
TEST=All current tests pass.

Review URL: https://codereview.chromium.org/388763003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282798 0039d316-1c4b-4281-b951-d872f2087c98