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

Source/core/loader/ResourceLoader.cpp

Index: Source/core/loader/ResourceLoader.cpp
diff --git a/Source/core/loader/ResourceLoader.cpp b/Source/core/loader/ResourceLoader.cpp
index 809f7dabdeee7f4b1b3d0492e52cac1ce4735e40..16faac7d0684a9a67787c7388ae4b0228fc83ac5 100644
--- a/Source/core/loader/ResourceLoader.cpp
+++ b/Source/core/loader/ResourceLoader.cpp
@@ -260,7 +260,7 @@ void ResourceLoader::cancel(const ResourceError& error)
     if (m_reachedTerminalState)
         return;
        
-    ResourceError nonNullError = error.isNull() ? ResourceError::cancelledError(m_request.url()) : error;
+    ResourceError nonNullError = error.isNull() ? cancelledError() : error;
 
     // This function calls out to clients at several points that might do
     // something that causes the last reference to this object to go away.
@@ -302,6 +302,16 @@ void ResourceLoader::cancel(const ResourceError& error)
     releaseResources();
 }
 
+ResourceError ResourceLoader::cancelledError()
+{
+    return frameLoader()->cancelledError(m_request);
+}
+
+ResourceError ResourceLoader::cannotShowURLError()
+{
+    return frameLoader()->client()->cannotShowURLError(m_request);
+}
+
 void ResourceLoader::willSendRequest(ResourceHandle*, ResourceRequest& request, const ResourceResponse& redirectResponse)
 {
     if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForRedirect(this, request, redirectResponse))