Return reference from styleEngine() accessor.

Source/core/html/imports/HTMLImportLoader.cpp

 /*
  * Copyright (C) 2013 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 158 matching lines @@
 }
 
 void HTMLImportLoader::didRemoveAllPendingStylesheet()
 {
     if (m_state == StateParsed)
         setState(finishLoading());
 }
 
 bool HTMLImportLoader::hasPendingResources() const
 {
-    return m_document && m_document->styleEngine()->hasPendingSheets();
+    return m_document && m_document->styleEngine().hasPendingSheets();
 }
 
 void HTMLImportLoader::didFinishLoading()
 {
     for (size_t i = 0; i < m_imports.size(); ++i)
         m_imports[i]->didFinishLoading();
 
     clearResource();
 
     ASSERT(!m_document || !m_document->parsing());
@@ skipping 41 matching lines @@
 #if ENABLE(OILPAN)
     visitor->trace(m_imports);
 #endif
     visitor->trace(m_document);
     visitor->trace(m_writer);
     visitor->trace(m_microtaskQueue);
     DocumentParserClient::trace(visitor);
 }
 
 } // namespace blink