Have Frame::animation() return a reference

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 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.
@@ skipping 392 matching lines @@
         es.throwUninformativeAndGenericDOMException(InvalidAccessError);
         return 0;
     }
     return treeScope1->comparePosition(*treeScope2);
 }
 
 unsigned Internals::numberOfActiveAnimations() const
 {
     Frame* contextFrame = frame();
     if (RuntimeEnabledFeatures::webAnimationsCSSEnabled())
-        return frame()->document()->timeline()->numberOfActiveAnimationsForTesting();
-    if (AnimationController* controller = contextFrame->animation())
-        return controller->numberOfActiveAnimations(contextFrame->document());
-    return 0;
+        return contextFrame->document()->timeline()->numberOfActiveAnimationsForTesting();
+    return contextFrame->animation().numberOfActiveAnimations(contextFrame->document());
 }
 
 void Internals::pauseAnimations(double pauseTime, ExceptionState& es)
 {
     if (pauseTime < 0) {
         es.throwUninformativeAndGenericDOMException(InvalidAccessError);
         return;
     }
 
     if (RuntimeEnabledFeatures::webAnimationsCSSEnabled())
         frame()->document()->timeline()->pauseAnimationsForTesting(pauseTime);
     else
-        frame()->animation()->pauseAnimationsForTesting(pauseTime);
+        frame()->animation().pauseAnimationsForTesting(pauseTime);
 }
 
 bool Internals::hasShadowInsertionPoint(const Node* root, ExceptionState& es) const
 {
     if (root && root->isShadowRoot())
         return toShadowRoot(root)->containsShadowElements();
 
     es.throwUninformativeAndGenericDOMException(InvalidAccessError);
     return 0;
 }
@@ skipping 1833 matching lines @@
     }
 
     document->updateLayout();
 
     RenderView* view = document->renderView();
     if (view->compositor())
         view->compositor()->updateCompositingLayers(CompositingUpdateFinishAllDeferredWork);
 }
 
 }