Migrate error messages, part 4 (v8natives.js).

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.
 
 var $observeNotifyChange;
 var $observeEnqueueSpliceRecord;
 var $observeBeginPerformSplice;
 var $observeEndPerformSplice;
 var $observeNativeObjectObserve;
 var $observeNativeObjectGetNotifier;
@@ skipping 536 matching lines @@
     };
   }
 
   ObjectFreezeJS(changeRecord);
   ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord);
 }
 
 
 function ObjectNotifierNotify(changeRecord) {
   if (!IS_SPEC_OBJECT(this))
-    throw MakeTypeError("called_on_non_object", ["notify"]);
+    throw MakeTypeError(kCalledOnNonObject, "notify");
 
   var objectInfo = ObjectInfoGetFromNotifier(this);
   if (IS_UNDEFINED(objectInfo))
     throw MakeTypeError("observe_notify_non_notifier");
   if (!IS_STRING(changeRecord.type))
     throw MakeTypeError("observe_type_non_string");
 
   ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord);
 }
 
 
 function ObjectNotifierPerformChange(changeType, changeFn) {
   if (!IS_SPEC_OBJECT(this))
-    throw MakeTypeError("called_on_non_object", ["performChange"]);
+    throw MakeTypeError(kCalledOnNonObject, "performChange");
 
   var objectInfo = ObjectInfoGetFromNotifier(this);
   if (IS_UNDEFINED(objectInfo))
     throw MakeTypeError("observe_notify_non_notifier");
   if (!IS_STRING(changeType))
     throw MakeTypeError("observe_perform_non_string");
   if (!IS_SPEC_FUNCTION(changeFn))
     throw MakeTypeError("observe_perform_non_function");
 
   var performChangeFn = %GetObjectContextNotifierPerformChange(objectInfo);
@@ skipping 97 matching lines @@
 
 $observeNotifyChange = NotifyChange;
 $observeEnqueueSpliceRecord = EnqueueSpliceRecord;
 $observeBeginPerformSplice = BeginPerformSplice;
 $observeEndPerformSplice = EndPerformSplice;
 $observeNativeObjectObserve = NativeObjectObserve;
 $observeNativeObjectGetNotifier = NativeObjectGetNotifier;
 $observeNativeObjectNotifierPerformChange = NativeObjectNotifierPerformChange;
 
 })();