Have Frame::loader() return a reference

Source/core/dom/CSSSelectorWatch.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 59 matching lines @@
     if (m_timerExpirations < 1) {
         m_timerExpirations++;
         m_callbackSelectorChangeTimer.startOneShot(0);
         return;
     }
     if (m_document.frame()) {
         Vector<String> addedSelectors;
         Vector<String> removedSelectors;
         copyToVector(m_addedSelectors, addedSelectors);
         copyToVector(m_removedSelectors, removedSelectors);
-        m_document.frame()->loader()->client()->selectorMatchChanged(addedSelectors, removedSelectors);
+        m_document.frame()->loader().client()->selectorMatchChanged(addedSelectors, removedSelectors);
     }
     m_addedSelectors.clear();
     m_removedSelectors.clear();
     m_timerExpirations = 0;
 }
 
 void CSSSelectorWatch::updateSelectorMatches(const Vector<String>& removedSelectors, const Vector<String>& addedSelectors)
 {
     bool shouldUpdateTimer = false;
 
@@ skipping 75 matching lines @@
 
         RefPtr<StyleRule> rule = StyleRule::create();
         rule->wrapperAdoptSelectorList(selectorList);
         rule->setProperties(callbackPropertySet);
         m_watchedCallbackSelectors.append(rule.release());
     }
     m_document.changedSelectorWatch();
 }
 
 } // namespace WebCore