Have Dictionary use V8TRYCATCH_FOR_V8STRINGRESOURCE() macro

Source/bindings/v8/V8BindingMacros.h

 /*
  * Copyright (C) 2010 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 67 matching lines @@
                 block.ReThrow();                                  \
                 return;                                           \
             }                                                     \
         }                                                         \
         if (UNLIKELY(!ok)) {                                      \
             throwTypeError(isolate);                              \
             return;                                               \
         }                                                         \
     }
 
+#define V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN(type, var, value, retVal) \
+    type var(value);                                                     \
+    if (!var.prepare())                                                  \
+        return retVal;
+
 #define V8TRYCATCH_FOR_V8STRINGRESOURCE(type, var, value) \
-    type var(value);                                            \
-    if (!var.prepare())                                         \
-        return v8::Undefined();
+    V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN(type, var, value, v8::Undefined());
 
 #define V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(type, var, value) \
     type var(value);                                                 \
     if (!var.prepare())                                              \
         return;
 
 } // namespace WebCore
 
 #endif // V8BindingMacros_h