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

Source/web/ContextMenuClientImpl.cpp

 /*
  * Copyright (C) 2009, 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:
  *
  *     * 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 244 matching lines @@
                 if (!text.isEmpty()) {
                     data.selectedText = text;
                     data.editFlags |= WebContextMenuData::CanCopy;
                 }
                 data.editFlags &= ~WebContextMenuData::CanTranslate;
                 data.linkURL = plugin->plugin()->linkAtPosition(data.mousePosition);
                 if (plugin->plugin()->supportsPaginatedPrint())
                     data.mediaFlags |= WebContextMenuData::MediaCanPrint;
 
                 HTMLPlugInImageElement* pluginElement = toHTMLPlugInImageElement(r.innerNonSharedNode());
-                data.srcURL = pluginElement->document()->completeURL(pluginElement->url());
+                data.srcURL = pluginElement->document().completeURL(pluginElement->url());
                 data.mediaFlags |= WebContextMenuData::MediaCanSave;
 
                 // Add context menu commands that are supported by the plugin.
                 if (plugin->plugin()->canRotateView())
                     data.mediaFlags |= WebContextMenuData::MediaCanRotate;
             }
         }
     }
 
     // An image can to be null for many reasons, like being blocked, no image
@@ skipping 136 matching lines @@
         outputItems[i] = subItems[i];
     subMenuItems.swap(outputItems);
 }
 
 void ContextMenuClientImpl::populateCustomMenuItems(const WebCore::ContextMenu* defaultMenu, WebContextMenuData* data)
 {
     populateSubMenuItems(defaultMenu->items(), data->customItems);
 }
 
 } // namespace WebKit