Remove unused parts of MediaControllerInterface

Source/core/html/MediaController.cpp

 /*
  * Copyright (C) 2011 Apple 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 601 matching lines @@
     if (m_paused)
         return true;
 
     for (size_t index = 0; index < m_mediaElements.size(); ++index) {
         if (!m_mediaElements[index]->canPlay())
             return false;
     }
     return true;
 }
 
-bool MediaController::hasCurrentSrc() const
-{
-    for (size_t index = 0; index < m_mediaElements.size(); ++index) {
-        if (!m_mediaElements[index]->hasCurrentSrc())
-            return false;
-    }
-    return true;
-}
-
 const AtomicString& MediaController::interfaceName() const
 {
     return EventTargetNames::MediaController;
 }
 
 // The spec says to fire periodic timeupdate events (those sent while playing) every
 // "15 to 250ms", we choose the slowest frequency
 static const double maxTimeupdateEventFrequency = 0.25;
 
 void MediaController::startTimeupdateTimer()
@@ skipping 13 matching lines @@
 {
     double now = WTF::currentTime();
     double timedelta = now - m_previousTimeupdateTime;
 
     if (timedelta < maxTimeupdateEventFrequency)
         return;
 
     scheduleEvent(EventTypeNames::timeupdate);
     m_previousTimeupdateTime = now;
 }