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

Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 2305 matching lines @@
 
 void FrameLoader::receivedMainResourceError(const ResourceError& error)
 {
     // Retain because the stop may release the last reference to it.
     RefPtr<Frame> protect(m_frame);
 
     RefPtr<DocumentLoader> loader = activeDocumentLoader();
     // FIXME: Don't want to do this if an entirely new load is going, so should check
     // that both data sources on the frame are either this or nil.
     stop();
-
-    // FIXME: We really ought to be able to just check for isCancellation() here, but there are some
-    // ResourceErrors that setIsCancellation() but aren't created by ResourceError::cancelledError().
-    ResourceError c(ResourceError::cancelledError(KURL()));
-    if (error.errorCode() != c.errorCode() || error.domain() != c.domain())
+    if (m_client->shouldFallBack(error))
         handleFallbackContent();
 
     if (m_state == FrameStateProvisional && m_provisionalDocumentLoader) {
         if (m_submittedFormURL == m_provisionalDocumentLoader->originalRequestCopy().url())
             m_submittedFormURL = KURL();
             
         // Call clientRedirectCancelledOrFinished here so that the frame load delegate is notified that the redirect's
         // status has changed, if there was a redirect. The frame load delegate may have saved some state about
         // the redirect in its -webView:willPerformClientRedirectToURL:delay:fireDate:forFrame:. Since we are definitely
         // not going to use this provisional resource, as it was cancelled, notify the frame load delegate that the redirect
@@ skipping 248 matching lines @@
     identifier = 0;
     if (Page* page = m_frame->page()) {
         identifier = createUniqueIdentifier();
         notifier()->assignIdentifierToInitialRequest(identifier, m_documentLoader.get(), request);
     }
 
     ResourceRequest newRequest(request);
     notifier()->dispatchWillSendRequest(m_documentLoader.get(), identifier, newRequest, ResourceResponse());
 
     if (newRequest.isNull())
-        error = ResourceError::cancelledError(request.url());
+        error = cancelledError(request);
     else
         error = ResourceError();
 
     request = newRequest;
 }
 
 void FrameLoader::loadedResourceFromMemoryCache(CachedResource* resource)
 {
     Page* page = m_frame->page();
     if (!page)
@@ skipping 232 matching lines @@
     m_requestedHistoryItem = item;
     HistoryItem* currentItem = history()->currentItem();
     bool sameDocumentNavigation = currentItem && item->shouldDoSameDocumentNavigationTo(currentItem);
 
     if (sameDocumentNavigation)
         loadSameDocumentItem(item);
     else
         loadDifferentDocumentItem(item, loadType, MayAttemptCacheOnlyLoadForFormSubmissionItem);
 }
 
+ResourceError FrameLoader::cancelledError(const ResourceRequest& request) const
+{
+    ResourceError error = m_client->cancelledError(request);
+    error.setIsCancellation(true);
+    return error;
+}
+
 void FrameLoader::setTitle(const StringWithDirection& title)
 {
     documentLoader()->setTitle(title);
 }
 
 String FrameLoader::referrer() const
 {
     return m_documentLoader ? m_documentLoader->request().httpReferrer() : "";
 }
 
@@ skipping 195 matching lines @@
     FloatRect newWindowRect = DOMWindow::adjustWindowRect(page, windowRect);
 
     page->chrome()->setWindowRect(newWindowRect);
     page->chrome()->show();
 
     created = true;
     return frame;
 }
 
 } // namespace WebCore