Allow play/pause on default controls to clear media errors.

third_party/WebKit/Source/core/html/shadow/MediaControls.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 234 matching lines @@
     if (useNewUi) {
         // Show everything that we might hide.
         // If we don't have a duration, then mark it to be hidden.  For the
         // old UI case, want / don't want is the same as show / hide since
         // it is never marked as not fitting.
         m_durationDisplay->setIsWanted(std::isfinite(duration));
         m_currentTimeDisplay->setIsWanted(true);
         m_timeline->setIsWanted(true);
     }
 
+    // If the player has entered an error state, force it into the paused state.
+    if (mediaElement().error())
+        mediaElement().pause();
+
     updatePlayState();
 
     updateCurrentTimeDisplay();
 
     m_timeline->setDuration(duration);
     m_timeline->setPosition(mediaElement().currentTime());
 
     updateVolume();
 
     refreshClosedCaptionsButtonVisibility();
@@ skipping 486 matching lines @@
     visitor->trace(m_toggleClosedCaptionsButton);
     visitor->trace(m_fullScreenButton);
     visitor->trace(m_durationDisplay);
     visitor->trace(m_enclosure);
     visitor->trace(m_castButton);
     visitor->trace(m_overlayCastButton);
     HTMLDivElement::trace(visitor);
 }
 
 } // namespace blink