Convert SecurityError exceptions to 'es.throwSecurityError()'.

Source/core/page/History.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 128 matching lines @@
     return KURL(baseURL, urlString);
 }
 
 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& title, const String& urlString, SameDocumentNavigationSource sameDocumentNavigationSource, ExceptionState& es)
 {
     if (!m_frame || !m_frame->page())
         return;
 
     KURL fullURL = urlForState(urlString);
     if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
-        es.throwDOMException(SecurityError, "A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "'.");
+        // We can safely expose the URL to JavaScript, as a) no redirection takes place: JavaScript already had this URL, b) JavaScript can only access a same-origin History object.
+        es.throwSecurityError("A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "'.");
         return;
     }
     m_frame->loader()->updateForSameDocumentNavigation(fullURL, sameDocumentNavigationSource, data, title);
 }
 
 } // namespace WebCore