Have Node::document() return a reference instead of a pointer

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 184 matching lines @@
             domWindow->addEventListener("resize", listener, false);
         m_imageElement->addEventListener("click", listener.release(), false);
     }
 
     rootElement->appendChild(head);
     rootElement->appendChild(body);
 }
 
 float ImageDocument::scale() const
 {
-    if (!m_imageElement || m_imageElement->document() != this)
+    if (!m_imageElement || &m_imageElement->document() != this)
         return 1.0f;
 
     FrameView* view = frame()->view();
     if (!view)
         return 1;
 
     LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
     LayoutSize windowSize = LayoutSize(view->width(), view->height());
 
     float widthScale = (float)windowSize.width() / imageSize.width();
     float heightScale = (float)windowSize.height() / imageSize.height();
 
     return min(widthScale, heightScale);
 }
 
 void ImageDocument::resizeImageToFit()
 {
-    if (!m_imageElement || m_imageElement->document() != this || pageZoomFactor(this) > 1)
+    if (!m_imageElement || &m_imageElement->document() != this || pageZoomFactor(this) > 1)
         return;
 
     LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
 
     float scale = this->scale();
     m_imageElement->setWidth(static_cast<int>(imageSize.width() * scale));
     m_imageElement->setHeight(static_cast<int>(imageSize.height() * scale));
 
     m_imageElement->setInlineStyleProperty(CSSPropertyCursor, CSSValueWebkitZoomIn);
 }
@@ skipping 34 matching lines @@
     m_imageSizeIsKnown = true;
 
     if (shouldShrinkToFit()) {
         // Force resizing of the image
         windowSizeChanged();
     }
 }
 
 void ImageDocument::restoreImageSize()
 {
-    if (!m_imageElement || !m_imageSizeIsKnown || m_imageElement->document() != this || pageZoomFactor(this) < 1)
+    if (!m_imageElement || !m_imageSizeIsKnown || &m_imageElement->document() != this || pageZoomFactor(this) < 1)
         return;
 
     LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), 1.0f);
     m_imageElement->setWidth(imageSize.width());
     m_imageElement->setHeight(imageSize.height());
 
     if (imageFitsInWindow())
         m_imageElement->removeInlineStyleProperty(CSSPropertyCursor);
     else
         m_imageElement->setInlineStyleProperty(CSSPropertyCursor, CSSValueWebkitZoomOut);
 
     m_didShrinkImage = false;
 }
 
 bool ImageDocument::imageFitsInWindow() const
 {
-    if (!m_imageElement || m_imageElement->document() != this)
+    if (!m_imageElement || &m_imageElement->document() != this)
         return true;
 
     FrameView* view = frame()->view();
     if (!view)
         return true;
 
     LayoutSize imageSize = m_imageElement->cachedImage()->imageSizeForRenderer(m_imageElement->renderer(), pageZoomFactor(this));
     LayoutSize windowSize = LayoutSize(view->width(), view->height());
 
     return imageSize.width() <= windowSize.width() && imageSize.height() <= windowSize.height();
 }
 
 void ImageDocument::windowSizeChanged()
 {
-    if (!m_imageElement || !m_imageSizeIsKnown || m_imageElement->document() != this)
+    if (!m_imageElement || !m_imageSizeIsKnown || &m_imageElement->document() != this)
         return;
 
     bool fitsInWindow = imageFitsInWindow();
 
     // If the image has been explicitly zoomed in, restore the cursor if the image fits
     // and set it to a zoom out cursor if the image doesn't fit
     if (!m_shouldShrinkImage) {
         if (fitsInWindow)
             m_imageElement->removeInlineStyleProperty(CSSPropertyCursor);
         else
@@ skipping 49 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener)
 {
     if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
         return m_doc == imageEventListener->m_doc;
     return false;
 }
 
 }