Rework dispatchEvent so it is consistent for isTrusted support.

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 119 matching lines @@
 {
     // This method can only be called on cues while they are associated with
     // a(n enabled) track (and hence that track's list of cues should exist.)
     ASSERT(track() && track()->cues());
     TextTrackCueList* cueList = track()->cues();
     if (!cueList->isCueIndexValid(m_cueIndex))
         cueList->validateCueIndexes();
     return m_cueIndex;
 }
 
-bool TextTrackCue::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
+bool TextTrackCue::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     // When a TextTrack's mode is disabled: no cues are active, no events fired.
     if (!track() || track()->mode() == TextTrack::disabledKeyword())
         return false;
 
-    return EventTarget::dispatchEvent(event);
+    return EventTarget::dispatchEventInternal(event);
 }
 
 const AtomicString& TextTrackCue::interfaceName() const
 {
     return EventTargetNames::TextTrackCue;
 }
 
 DEFINE_TRACE(TextTrackCue)
 {
     visitor->trace(m_track);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink