Remove unfailable null checks in MediaControls

Source/core/html/shadow/MediaControlsAndroid.cpp

 /*
  * Copyright (C) 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 41 matching lines @@
     m_overlayEnclosure = overlayEnclosure.get();
     appendChild(overlayEnclosure.release(), exceptionState);
     if (exceptionState.hadException())
         return false;
 
     return MediaControls::initializeControls(document);
 }
 
 void MediaControlsAndroid::setMediaController(MediaControllerInterface* controller)
 {
-    if (m_overlayPlayButton)
-        m_overlayPlayButton->setMediaController(controller);
-    if (m_overlayEnclosure)
-        m_overlayEnclosure->setMediaController(controller);
+    m_overlayPlayButton->setMediaController(controller);
+    m_overlayEnclosure->setMediaController(controller);
     MediaControls::setMediaController(controller);
 }
 
 void MediaControlsAndroid::playbackStarted()
 {
     m_overlayPlayButton->updateDisplayType();
     MediaControls::playbackStarted();
 }
 
 void MediaControlsAndroid::playbackStopped()
 {
     m_overlayPlayButton->updateDisplayType();
     MediaControls::playbackStopped();
 }
 
 void MediaControlsAndroid::insertTextTrackContainer(PassRefPtr<MediaControlTextTrackContainerElement> textTrackContainer)
 {
     // Insert it before the overlay play button so it always displays behind it.
     m_overlayEnclosure->insertBefore(textTrackContainer, m_overlayPlayButton);
 }
 }