Allow the implementation to return references instead of pointers to the bindings

Source/core/html/track/vtt/VTTRegion.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 321 matching lines @@
     return m_regionDisplayTree;
 }
 
 void VTTRegion::willRemoveVTTCueBox(VTTCueBox* box)
 {
     WTF_LOG(Media, "VTTRegion::willRemoveVTTCueBox");
     ASSERT(m_cueContainer->contains(box));
 
     double boxHeight = box->getBoundingClientRect()->bottom() - box->getBoundingClientRect()->top();
 
-    m_cueContainer->classList()->remove(textTrackCueContainerScrollingClass(), ASSERT_NO_EXCEPTION);
+    m_cueContainer->classList().remove(textTrackCueContainerScrollingClass(), ASSERT_NO_EXCEPTION);
 
     m_currentTop += boxHeight;
     m_cueContainer->setInlineStyleProperty(CSSPropertyTop, m_currentTop, CSSPrimitiveValue::CSS_PX);
 }
 
 void VTTRegion::appendVTTCueBox(PassRefPtr<VTTCueBox> displayBox)
 {
     ASSERT(m_cueContainer);
 
     if (m_cueContainer->contains(displayBox.get()))
@@ skipping 10 matching lines @@
 
     // FIXME: This should not be causing recalc styles in a loop to set the "top" css
     // property to move elements. We should just scroll the text track cues on the
     // compositor with an animation.
 
     if (m_scrollTimer.isActive())
         return;
 
     // If it's a scrolling region, add the scrolling class.
     if (isScrollingRegion())
-        m_cueContainer->classList()->add(textTrackCueContainerScrollingClass(), ASSERT_NO_EXCEPTION);
+        m_cueContainer->classList().add(textTrackCueContainerScrollingClass(), ASSERT_NO_EXCEPTION);
 
     float regionBottom = m_regionDisplayTree->getBoundingClientRect()->bottom();
 
     // Find first cue that is not entirely displayed and scroll it upwards.
     for (Element* child = ElementTraversal::firstWithin(*m_cueContainer); child && !m_scrollTimer.isActive(); child = ElementTraversal::nextSibling(*child)) {
         float childTop = toHTMLDivElement(child)->getBoundingClientRect()->top();
         float childBottom = toHTMLDivElement(child)->getBoundingClientRect()->bottom();
 
         if (regionBottom >= childBottom)
             continue;
@@ skipping 81 matching lines @@
 
 void VTTRegion::scrollTimerFired(Timer<VTTRegion>*)
 {
     WTF_LOG(Media, "VTTRegion::scrollTimerFired");
 
     stopTimer();
     displayLastVTTCueBox();
 }
 
 } // namespace WebCore