Improve 'XMLHttpRequest' exception messages.

Source/bindings/v8/ExceptionMessages.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #include "config.h"
 #include "bindings/v8/ExceptionMessages.h"
 
 namespace WebCore {
 
 String ExceptionMessages::failedToExecute(const String& method, const String& type, const String& detail)
 {
     return "Failed to execute '" + method + "' on '" + type + "': " + detail;
 }
 
+String ExceptionMessages::failedToGet(const String& property, const String& type, const String& detail)
+{
+    return "Failed to read the '" + property + "' property from '" + type + "': " + detail;
+}
+
+String ExceptionMessages::failedToSet(const String& property, const String& type, const String& detail)
+{
+    return "Failed to set the '" + property + "' property on '" + type + "': " + detail;
+}
+
 } // namespace WebCore