Improve media-related exception messages

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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 1829 matching lines @@
     }
 
     refreshCachedTime();
 
     return m_cachedTime;
 }
 
 void HTMLMediaElement::setCurrentTime(double time, ExceptionState& exceptionState)
 {
     if (m_mediaController) {
-        exceptionState.throwDOMException(InvalidStateError, "No media controller is available.");
+        exceptionState.throwDOMException(InvalidStateError, "The element is slaved to a MediaController.");
         return;
     }
     seek(time, exceptionState);
 }
 
 double HTMLMediaElement::duration() const
 {
     if (!m_player || m_readyState < HAVE_METADATA)
         return numeric_limits<double>::quiet_NaN();
 
@@ skipping 198 matching lines @@
 double HTMLMediaElement::volume() const
 {
     return m_volume;
 }
 
 void HTMLMediaElement::setVolume(double vol, ExceptionState& exceptionState)
 {
     WTF_LOG(Media, "HTMLMediaElement::setVolume(%f)", vol);
 
     if (vol < 0.0f || vol > 1.0f) {
-        exceptionState.throwDOMException(IndexSizeError, ExceptionMessages::indexOutsideRange("volume", vol, 0.0, ExceptionMessages::ExclusiveBound, 1.0, ExceptionMessages::ExclusiveBound));
+        exceptionState.throwDOMException(IndexSizeError, ExceptionMessages::indexOutsideRange("volume", vol, 0.0, ExceptionMessages::InclusiveBound, 1.0, ExceptionMessages::InclusiveBound));
         return;
     }
 
     if (m_volume != vol) {
         m_volume = vol;
         updateVolume();
         scheduleEvent(EventTypeNames::volumechange);
     }
 }
 
@@ skipping 1538 matching lines @@
 {
     m_mediaSource->setWebMediaSourceAndOpen(adoptPtr(webMediaSource));
 }
 
 bool HTMLMediaElement::isInteractiveContent() const
 {
     return fastHasAttribute(controlsAttr);
 }
 
 }