Have Frame::loader() return a reference

Source/core/loader/MixedContentChecker.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 28 matching lines @@
 
 namespace WebCore {
 
 MixedContentChecker::MixedContentChecker(Frame* frame)
     : m_frame(frame)
 {
 }
 
 FrameLoaderClient* MixedContentChecker::client() const
 {
-    return m_frame->loader()->client();
+    return m_frame->loader().client();
 }
 
 // static
 bool MixedContentChecker::isMixedContent(SecurityOrigin* securityOrigin, const KURL& url)
 {
     if (securityOrigin->protocol() != "https")
         return false; // We only care about HTTPS security origins.
 
     // We're in a secure context, so |url| is mixed content if it's insecure.
     return !SecurityOrigin::isSecure(url);
@@ skipping 30 matching lines @@
 }
 
 void MixedContentChecker::logWarning(bool allowed, const String& action, const KURL& target) const
 {
     String message = String(allowed ? "" : "[blocked] ") + "The page at '" + m_frame->document()->url().elidedString() + "' was loaded over HTTPS, but " + action + " insecure content from '" + target.elidedString() + "': this content should also be loaded over HTTPS.\n";
     MessageLevel messageLevel = allowed ? WarningMessageLevel : ErrorMessageLevel;
     m_frame->document()->addConsoleMessage(SecurityMessageSource, messageLevel, message);
 }
 
 } // namespace WebCore