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

Source/WebCore/html/PluginDocument.cpp

Index: Source/WebCore/html/PluginDocument.cpp
===================================================================
--- Source/WebCore/html/PluginDocument.cpp	(revision 148494)
+++ Source/WebCore/html/PluginDocument.cpp	(working copy)
@@ -26,6 +26,7 @@
 #include "PluginDocument.h"
 
 #include "DocumentLoader.h"
+#include "CancelledResourceError.h"
 #include "ExceptionCodePlaceholder.h"
 #include "Frame.h"
 #include "FrameLoader.h"
@@ -179,7 +180,7 @@
         return;
 
     DocumentLoader* documentLoader = frame()->loader()->activeDocumentLoader();
-    documentLoader->cancelMainResourceLoad(frame()->loader()->cancelledError(documentLoader->request()));
+    documentLoader->cancelMainResourceLoad(CancelledResourceError(documentLoader->request().url()));
     setShouldLoadPluginManually(false);
 }