Merge 94102 - [Chromium] Add null checks for document()->loader()

Source/WebKit/chromium/src/ContextMenuClientImpl.cpp

 /*
  * Copyright (C) 2009 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 225 matching lines @@
                 data.mediaFlags |= WebContextMenuData::MediaCanSave;
             }
         }
     }
 
     data.isImageBlocked =
         (data.mediaType == WebContextMenuData::MediaTypeImage) && !r.image();
 
     // If it's not a link, an image, a media element, or an image/media link,
     // show a selection menu or a more generic page menu.
-    data.frameEncoding = selectedFrame->document()->loader()->writer()->encoding();
+    if (selectedFrame->document()->loader())
+        data.frameEncoding = selectedFrame->document()->loader()->writer()->encoding();
 
     // Send the frame and page URLs in any case.
     data.pageURL = urlFromFrame(m_webView->mainFrameImpl()->frame());
     if (selectedFrame != m_webView->mainFrameImpl()->frame()) {
         data.frameURL = urlFromFrame(selectedFrame);
         RefPtr<HistoryItem> historyItem = selectedFrame->loader()->history()->currentItem();
         if (historyItem)
             data.frameHistoryItem = WebHistoryItem(historyItem);
     }
 
@@ skipping 89 matching lines @@
         customItems.append(outputItem);
     }
 
     WebVector<WebMenuItemInfo> outputItems(customItems.size());
     for (size_t i = 0; i < customItems.size(); ++i)
         outputItems[i] = customItems[i];
     data->customItems.swap(outputItems);
 }
 
 } // namespace WebKit