Bug 1273018: P2. Don't reject audio waiting promise when performing a video only seek. r=gerald

MozReview-Commit-ID: G1MeZWxLayy

--HG--
extra : rebase_source : ea07192655c474997d7a3253adf9f13eefd45212

dom/media/MediaFormatReader.cpp

@@ -1304,7 +1304,9 @@ MediaFormatReader::ResetDecode(TargetQueues aQueues)
   mSkipRequest.DisconnectIfExists();
 
   // Do the same for any data wait promises.
-  mAudio.mWaitingPromise.RejectIfExists(WaitForDataRejectValue(MediaData::AUDIO_DATA, WaitForDataRejectValue::CANCELED), __func__);
+  if (aQueues == AUDIO_VIDEO) {
+    mAudio.mWaitingPromise.RejectIfExists(WaitForDataRejectValue(MediaData::AUDIO_DATA, WaitForDataRejectValue::CANCELED), __func__);
+  }
   mVideo.mWaitingPromise.RejectIfExists(WaitForDataRejectValue(MediaData::VIDEO_DATA, WaitForDataRejectValue::CANCELED), __func__);
 
   // Reset miscellaneous seeking state.