Have Frame::loader() return a reference

Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 109 matching lines @@
     return result.toString();
 }
 
 size_t ImageDocumentParser::appendBytes(const char* data, size_t length)
 {
     if (!length)
         return 0;
 
     Frame* frame = document()->frame();
     Settings* settings = frame->settings();
-    if (!frame->loader()->client()->allowImage(!settings || settings->areImagesEnabled(), document()->url()))
+    if (!frame->loader().client()->allowImage(!settings || settings->areImagesEnabled(), document()->url()))
         return 0;
 
     document()->cachedImage()->appendData(data, length);
     document()->imageUpdated();
     return 0;
 }
 
 void ImageDocumentParser::finish()
 {
     if (!isStopped() && document()->imageElement()) {
         ImageResource* cachedImage = document()->cachedImage();
         cachedImage->finish();
-        cachedImage->setResponse(document()->frame()->loader()->documentLoader()->response());
+        cachedImage->setResponse(document()->frame()->loader().documentLoader()->response());
 
         // Report the natural image size in the page title, regardless of zoom level.
         // At a zoom level of 1 the image is guaranteed to have an integer size.
         IntSize size = flooredIntSize(cachedImage->imageSizeForRenderer(document()->imageElement()->renderer(), 1.0f));
         if (size.width()) {
             // Compute the title, we use the decoded filename of the resource, falling
             // back on the (decoded) hostname if there is no path.
             String fileName = decodeURLEscapeSequences(document()->url().lastPathComponent());
             if (fileName.isEmpty())
                 fileName = document()->url().host();
@@ skipping 23 matching lines @@
 {
     return ImageDocumentParser::create(this);
 }
 
 void ImageDocument::createDocumentStructure()
 {
     RefPtr<HTMLHtmlElement> rootElement = HTMLHtmlElement::create(*this);
     appendChild(rootElement);
     rootElement->insertedByParser();
 
-    if (frame() && frame()->loader())
-        frame()->loader()->dispatchDocumentElementAvailable();
+    if (frame())
+        frame()->loader().dispatchDocumentElementAvailable();
 
     RefPtr<HTMLHeadElement> head = HTMLHeadElement::create(*this);
     RefPtr<HTMLMetaElement> meta = HTMLMetaElement::create(*this);
     meta->setAttribute(nameAttr, "viewport");
     meta->setAttribute(contentAttr, "width=device-width");
     head->appendChild(meta);
 
     RefPtr<HTMLBodyElement> body = HTMLBodyElement::create(*this);
     body->setAttribute(styleAttr, "margin: 0px;");
 
@@ skipping 185 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener)
 {
     if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
         return m_doc == imageEventListener->m_doc;
     return false;
 }
 
 }