Have Document::timeline() / Document::transitionTimeline() 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 458 matching lines @@
         exceptionState.throwDOMException(InvalidAccessError, String::format("The %s node is neither a document node, nor a shadow root.", treeScope1 ? "second" : "first"));
         return 0;
     }
     return treeScope1->comparePosition(*treeScope2);
 }
 
 unsigned Internals::numberOfActiveAnimations() const
 {
     LocalFrame* contextFrame = frame();
     Document* document = contextFrame->document();
-    return document->timeline()->numberOfActiveAnimationsForTesting() + document->transitionTimeline()->numberOfActiveAnimationsForTesting();
+    return document->timeline().numberOfActiveAnimationsForTesting() + document->transitionTimeline().numberOfActiveAnimationsForTesting();
 }
 
 void Internals::pauseAnimations(double pauseTime, ExceptionState& exceptionState)
 {
     if (pauseTime < 0) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::indexExceedsMinimumBound("pauseTime", pauseTime, 0.0));
         return;
     }
 
     frame()->view()->updateLayoutAndStyleForPainting();
-    frame()->document()->timeline()->pauseAnimationsForTesting(pauseTime);
-    frame()->document()->transitionTimeline()->pauseAnimationsForTesting(pauseTime);
+    frame()->document()->timeline().pauseAnimationsForTesting(pauseTime);
+    frame()->document()->transitionTimeline().pauseAnimationsForTesting(pauseTime);
 }
 
 bool Internals::hasShadowInsertionPoint(const Node* root, ExceptionState& exceptionState) const
 {
     if (root && root->isShadowRoot())
         return toShadowRoot(root)->containsShadowElements();
 
     exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::argumentNullOrIncorrectType(1, "Node"));
     return 0;
 }
@@ skipping 1869 matching lines @@
     return promise.then(AddOneFunction::create(context));
 }
 
 void Internals::trace(Visitor* visitor)
 {
     visitor->trace(m_runtimeFlags);
     visitor->trace(m_profilers);
 }
 
 }