Have Node::document() return a reference instead of a pointer

Source/core/page/animation/AnimationController.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 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
@@ skipping 295 matching lines @@
         child->animation()->resumeAnimations();
 }
 
 void AnimationControllerPrivate::suspendAnimationsForDocument(Document* document)
 {
     setBeginAnimationUpdateTime(cBeginAnimationUpdateTimeNotSet);
 
     RenderObjectAnimationMap::const_iterator animationsEnd = m_compositeAnimations.end();
     for (RenderObjectAnimationMap::const_iterator it = m_compositeAnimations.begin(); it != animationsEnd; ++it) {
         RenderObject* renderer = it->key;
-        if (renderer->document() == document) {
+        if (&renderer->document() == document) {
             CompositeAnimation* compAnim = it->value.get();
             compAnim->suspendAnimations();
         }
     }
 
     scheduleService();
 }
 
 void AnimationControllerPrivate::resumeAnimationsForDocument(Document* document)
 {
     setBeginAnimationUpdateTime(cBeginAnimationUpdateTimeNotSet);
 
     RenderObjectAnimationMap::const_iterator animationsEnd = m_compositeAnimations.end();
     for (RenderObjectAnimationMap::const_iterator it = m_compositeAnimations.begin(); it != animationsEnd; ++it) {
         RenderObject* renderer = it->key;
-        if (renderer->document() == document) {
+        if (&renderer->document() == document) {
             CompositeAnimation* compAnim = it->value.get();
             compAnim->resumeAnimations();
         }
     }
 
     scheduleService();
 }
 
 void AnimationControllerPrivate::pauseAnimationsForTesting(double t)
 {
@@ skipping 41 matching lines @@
 }
 
 unsigned AnimationControllerPrivate::numberOfActiveAnimations(Document* document) const
 {
     unsigned count = 0;
 
     RenderObjectAnimationMap::const_iterator animationsEnd = m_compositeAnimations.end();
     for (RenderObjectAnimationMap::const_iterator it = m_compositeAnimations.begin(); it != animationsEnd; ++it) {
         RenderObject* renderer = it->key;
         CompositeAnimation* compAnim = it->value.get();
-        if (renderer->document() == document)
+        if (&renderer->document() == document)
             count += compAnim->numberOfActiveAnimations();
     }
 
     return count;
 }
 
 void AnimationControllerPrivate::addToAnimationsWaitingForStyle(AnimationBase* animation)
 {
     // Make sure this animation is not in the start time waiters
     m_animationsWaitingForStartTimeResponse.remove(animation);
@@ skipping 86 matching lines @@
         return;
 
     if (m_data->clear(renderer)) {
         if (Node* node = renderer->node())
             node->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
     }
 }
 
 PassRefPtr<RenderStyle> AnimationController::updateAnimations(RenderObject* renderer, RenderStyle* newStyle)
 {
-    if (!renderer->document())
-        return newStyle;
-
     RenderStyle* oldStyle = renderer->style();
 
     if ((!oldStyle || (!oldStyle->animations() && !oldStyle->transitions())) && (!newStyle->animations() && !newStyle->transitions()))
         return newStyle;
 
     // Don't run transitions when printing.
     if (renderer->view()->printing())
         return newStyle;
 
     // Fetch our current set of implicit animations from a hashtable.  We then compare them
@@ skipping 95 matching lines @@
     if (!m_beginAnimationUpdateCount)
         m_data->endAnimationUpdate();
 }
 
 bool AnimationController::supportsAcceleratedAnimationOfProperty(CSSPropertyID property)
 {
     return CSSPropertyAnimation::animationOfPropertyIsAccelerated(property);
 }
 
 } // namespace WebCore