Return reference from styleEngine() accessor.

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 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 199 matching lines @@
 {
     return WebDocumentType(constUnwrap<Document>()->doctype());
 }
 
 void WebDocument::insertStyleSheet(const WebString& sourceCode)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     ASSERT(document);
     RefPtrWillBeRawPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(CSSParserContext(*document, 0));
     parsedSheet->parseString(sourceCode);
-    document->styleEngine()->addAuthorSheet(parsedSheet);
+    document->styleEngine().addAuthorSheet(parsedSheet);
 }
 
 void WebDocument::watchCSSSelectors(const WebVector<WebString>& webSelectors)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     Vector<String> selectors;
     selectors.append(webSelectors.data(), webSelectors.size());
     CSSSelectorWatch::from(*document).watchCSSSelectors(selectors);
 }
 
@@ skipping 60 matching lines @@
     // stylesheet gets applied. When isTransitionDocument is false, it ensures
     // the transition UA stylesheet is not applied when reverting the transition.
     unwrap<Document>()->setIsTransitionDocument(isTransitionDocument);
 }
 
 void WebDocument::beginExitTransition(const WebString& cssSelector, bool exitToNativeApp)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     if (!exitToNativeApp)
         document->hideTransitionElements(cssSelector);
-    document->styleEngine()->setExitTransitionStylesheetsEnabled(true);
+    document->styleEngine().setExitTransitionStylesheetsEnabled(true);
 }
 
 void WebDocument::revertExitTransition()
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
-    document->styleEngine()->setExitTransitionStylesheetsEnabled(false);
+    document->styleEngine().setExitTransitionStylesheetsEnabled(false);
 }
 
 void WebDocument::hideTransitionElements(const WebString& cssSelector)
 {
     RefPtrWillBeRawPtr<Document> document = unwrap<Document>();
     document->hideTransitionElements(cssSelector);
 }
 
 void WebDocument::showTransitionElements(const WebString& cssSelector)
 {
@@ skipping 66 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtrWillBeRawPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace blink