Don't hold the lock when calling VideoRendererBase::OnFrameAvailable().
Don't hold the lock when calling VideoRendererBase::OnFrameAvailable().

There's one instance of the code where we hold on to the lock when calling OnFrameAvailable(), which means if the subclass can crash if it calls a locked method such as GetCurrentFrame().

BUG=none
TEST=media_unittests

Review URL: http://codereview.chromium.org/6260052

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@73362 0039d316-1c4b-4281-b951-d872f2087c98

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