Fix error message for Object.observe accept argument

src/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // Overview:
 //
 // This file contains all of the routing and accounting for Object.observe.
 // User code will interact with these mechanisms via the Object.observe APIs
@@ skipping 253 matching lines @@
 function ObjectInfoGetPerformingTypes(objectInfo) {
   return objectInfo.performingCount > 0 ? objectInfo.performing : null;
 }
 
 function ConvertAcceptListToTypeMap(arg) {
   // We use undefined as a sentinel for the default accept list.
   if (IS_UNDEFINED(arg))
     return arg;
 
   if (!IS_SPEC_OBJECT(arg))
-    throw MakeTypeError("observe_accept_invalid");
+    throw MakeTypeError("observe_invalid_accept");
 
   var len = ToInteger(arg.length);
   if (len < 0) len = 0;
 
   return TypeMapCreateFromList(arg, len);
 }
 
 // CallbackInfo's optimized state is just a number which represents its global
 // priority. When a change record must be enqueued for the callback, it
 // normalizes. When delivery clears any pending change records, it re-optimizes.
@@ skipping 319 matching lines @@
     "observe", ArrayObserve,
     "unobserve", ArrayUnobserve
   ));
   InstallFunctions(notifierPrototype, DONT_ENUM, $Array(
     "notify", ObjectNotifierNotify,
     "performChange", ObjectNotifierPerformChange
   ));
 }
 
 SetupObjectObserve();