Bug 1328782. part 3 - remove the |VideoQueue().GetSize() > 0| check. r=kikuo

Since |GetAmpleVideoFrames() * mPlaybackRate + 1| is positive,
|VideoQueue().GetSize() >= GetAmpleVideoFrames() * mPlaybackRate + 1| must imply
|VideoQueue().GetSize() > 0|

MozReview-Commit-ID: 6cZ2XfUrmj

--HG--
extra : rebase_source : fc77e2cdebc4621fa68f94c6c3db81d4d921b851

dom/media/MediaDecoderStateMachine.cpp

@@ -2514,8 +2514,7 @@ MediaDecoderStateMachine::HaveEnoughDecodedAudio()
 bool MediaDecoderStateMachine::HaveEnoughDecodedVideo()
 {
   MOZ_ASSERT(OnTaskQueue());
-  return VideoQueue().GetSize() > 0 &&
-         VideoQueue().GetSize() >= GetAmpleVideoFrames() * mPlaybackRate + 1;
+  return VideoQueue().GetSize() >= GetAmpleVideoFrames() * mPlaybackRate + 1;
 }
 
 bool