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

Source/core/loader/PolicyChecker.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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
@@ skipping 108 matching lines @@
     m_callback.clear();
 }
 
 void PolicyChecker::stopCheck()
 {
     PolicyCallback callback = m_callback;
     m_callback.clear();
     callback.cancel();
 }
 
-void PolicyChecker::cannotShowMIMEType(const ResourceResponse& response)
-{
-    handleUnimplementablePolicy(m_frame->loader()->client()->cannotShowMIMETypeError(response));
-}
-
 void PolicyChecker::continueAfterNavigationPolicy(PolicyAction policy)
 {
     PolicyCallback callback = m_callback;
     m_callback.clear();
 
     bool shouldContinue = policy == PolicyUse;
 
     switch (policy) {
         case PolicyIgnore:
             callback.clearRequest();
             break;
         case PolicyDownload: {
             ResourceRequest request = callback.request();
             m_frame->loader()->setOriginalURLForDownloadRequest(request);
             m_frame->loader()->client()->startDownload(request);
             callback.clearRequest();
             break;
         }
-        case PolicyUse: {
-            ResourceRequest request(callback.request());
-
-            if (!m_frame->loader()->client()->canHandleRequest(request)) {
-                handleUnimplementablePolicy(m_frame->loader()->client()->cannotShowURLError(callback.request()));
-                callback.clearRequest();
-                shouldContinue = false;
-            }
+        case PolicyUse:
             break;
-        }
     }
 
     callback.call(shouldContinue);
 }
 
 void PolicyChecker::continueAfterNewWindowPolicy(PolicyAction policy)
 {
     PolicyCallback callback = m_callback;
     m_callback.clear();
 
     switch (policy) {
         case PolicyIgnore:
             callback.clearRequest();
             break;
         case PolicyDownload:
             m_frame->loader()->client()->startDownload(callback.request());
             callback.clearRequest();
             break;
         case PolicyUse:
             break;
     }
 
     callback.call(policy == PolicyUse);
 }
 
-void PolicyChecker::handleUnimplementablePolicy(const ResourceError& error)
-{
-    m_delegateIsHandlingUnimplementablePolicy = true;
-    m_frame->loader()->client()->dispatchUnableToImplementPolicy(error);
-    m_delegateIsHandlingUnimplementablePolicy = false;
-}
-
 } // namespace WebCore