232327 - Use valid JS in our javascript: URL wrapping around window._content

r=shaver sr=brendan

dom/src/base/nsDOMClassInfo.cpp

@@ -4181,7 +4181,7 @@ nsWindowSH::NewResolve(nsIXPConnectWrappedNative *wrapper, JSContext *cx,
                                        0,
                                        nsnull,
                                        NS_LITERAL_STRING("return this.content;"),
-                                       "javascript:return this.content; // See " __FILE__,
+                                       "javascript:this.content; // See " __FILE__,
                                        1, // lineno
                                        PR_FALSE,
                                        (void **) &getterObj);