Return reference from styleEngine() accessor.

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 271 matching lines @@
 }
 
 unsigned Internals::updateStyleAndReturnAffectedElementCount(ExceptionState& exceptionState) const
 {
     Document* document = contextDocument();
     if (!document) {
         exceptionState.throwDOMException(InvalidAccessError, "No context document is available.");
         return 0;
     }
 
-    unsigned beforeCount = document->styleEngine()->resolverAccessCount();
+    unsigned beforeCount = document->styleEngine().resolverAccessCount();
     document->updateRenderTreeIfNeeded();
-    return document->styleEngine()->resolverAccessCount() - beforeCount;
+    return document->styleEngine().resolverAccessCount() - beforeCount;
 }
 
 unsigned Internals::needsLayoutCount(ExceptionState& exceptionState) const
 {
     LocalFrame* contextFrame = frame();
     if (!contextFrame) {
         exceptionState.throwDOMException(InvalidAccessError, "No context frame is available.");
         return 0;
     }
 
@@ skipping 1980 matching lines @@
 {
     Vector<Document::TransitionElementData> elementData;
     frame()->document()->getTransitionElementData(elementData);
 
     for (const auto& element : elementData)
         frame()->document()->showTransitionElements(AtomicString(element.selector));
 }
 
 void Internals::setExitTransitionStylesheetsEnabled(bool enabled)
 {
-    frame()->document()->styleEngine()->setExitTransitionStylesheetsEnabled(enabled);
+    frame()->document()->styleEngine().setExitTransitionStylesheetsEnabled(enabled);
 }
 
 void Internals::forcePluginPlaceholder(HTMLElement* element, PassRefPtrWillBeRawPtr<DocumentFragment> fragment, ExceptionState& exceptionState)
 {
     if (!element->isPluginElement()) {
         exceptionState.throwDOMException(InvalidNodeTypeError, "The element provided is not a plugin.");
         return;
     }
     toHTMLPlugInElement(element)->setPlaceholder(DocumentFragmentPluginPlaceholder::create(fragment));
 }
@@ skipping 11 matching lines @@
 {
     ThreadState::current()->setGCState(ThreadState::GCScheduledForTesting);
 }
 
 ValueIterable<int>::IterationSource* Internals::startIteration(ScriptState*, ExceptionState&)
 {
     return new InternalsIterationSource();
 }
 
 } // namespace blink