Revert "Create errors (especially cancellation errors) internally to WebCore, rather"

Source/core/page/ContextMenuController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Igalia S.L
  *
  * 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 526 matching lines @@
     if (!node)
         return;
     Frame* frame = node->document()->frame();
     if (!frame)
         return;
 
     if (!m_hitTestResult.isContentEditable()) {
         FrameLoader* loader = frame->loader();
         KURL linkURL = m_hitTestResult.absoluteLinkURL();
         if (!linkURL.isEmpty()) {
-            appendItem(OpenLinkItem, m_contextMenu.get());
-            appendItem(OpenLinkInNewWindowItem, m_contextMenu.get());
-            appendItem(DownloadFileItem, m_contextMenu.get());
+            if (loader->client()->canHandleRequest(ResourceRequest(linkURL))) {
+                appendItem(OpenLinkItem, m_contextMenu.get());
+                appendItem(OpenLinkInNewWindowItem, m_contextMenu.get());
+                appendItem(DownloadFileItem, m_contextMenu.get());
+            }
             appendItem(CopyLinkItem, m_contextMenu.get());
         }
 
         KURL imageURL = m_hitTestResult.absoluteImageURL();
         if (!imageURL.isEmpty()) {
             if (!linkURL.isEmpty())
                 appendItem(*separatorItem(), m_contextMenu.get());
 
             appendItem(OpenImageInNewWindowItem, m_contextMenu.get());
             appendItem(DownloadImageItem, m_contextMenu.get());
@@ skipping 92 matching lines @@
                 if (!dictationAlternatives.isEmpty()) {
                     for (size_t i = 0; i < dictationAlternatives.size(); ++i) {
                         ContextMenuItem item(ActionType, ContextMenuItemTagDictationAlternative, dictationAlternatives[i]);
                         appendItem(item, m_contextMenu.get());
                     }
                     appendItem(*separatorItem(), m_contextMenu.get());
                 }
             }
         }
 
+        FrameLoader* loader = frame->loader();
         KURL linkURL = m_hitTestResult.absoluteLinkURL();
         if (!linkURL.isEmpty()) {
-            appendItem(OpenLinkItem, m_contextMenu.get());
-            appendItem(OpenLinkInNewWindowItem, m_contextMenu.get());
-            appendItem(DownloadFileItem, m_contextMenu.get());
+            if (loader->client()->canHandleRequest(ResourceRequest(linkURL))) {
+                appendItem(OpenLinkItem, m_contextMenu.get());
+                appendItem(OpenLinkInNewWindowItem, m_contextMenu.get());
+                appendItem(DownloadFileItem, m_contextMenu.get());
+            }
             appendItem(CopyLinkItem, m_contextMenu.get());
             appendItem(*separatorItem(), m_contextMenu.get());
         }
 
         if (m_hitTestResult.isSelected() && !inPasswordField && selectionContainsPossibleWord(frame)) {
             appendItem(SearchWebItem, m_contextMenu.get());
             appendItem(*separatorItem(), m_contextMenu.get());
         }
 
         appendItem(CutItem, m_contextMenu.get());
@@ skipping 249 matching lines @@
 {
     // Simulate a click in the middle of the accessibility object.
     PlatformMouseEvent mouseEvent(clickPoint, clickPoint, RightButton, PlatformEvent::MousePressed, 1, false, false, false, false, currentTime());
     bool handled = frame->eventHandler()->sendContextMenuEvent(mouseEvent);
     if (handled && client())
         client()->showContextMenu();
 }
 #endif
 
 } // namespace WebCore