Append "Callback" to each value of enum CallbackType

Source/bindings/core/v8/V8HiddenValue.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8HiddenValue_h
 #define V8HiddenValue_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptPromiseProperties.h"
 #include <v8.h>
 
 namespace blink {
 
 class ScriptWrappable;
 
 #define V8_HIDDEN_VALUES(V) \
     V(arrayBufferData) \
     V(privateScriptObjectIsInitialized) \
-    V(customElementAttached) \
-    V(customElementAttributeChanged) \
-    V(customElementCreated) \
-    V(customElementDetached) \
+    V(customElementAttachedCallback) \
+    V(customElementAttributeChangedCallback) \
+    V(customElementCreatedCallback) \
+    V(customElementDetachedCallback) \
     V(customElementDocument) \
     V(customElementIsInterfacePrototypeObject) \
     V(customElementNamespaceURI) \
     V(customElementTagName) \
     V(customElementType) \
     V(callback) \
     V(condition) \
     V(data) \
     V(detail) \
     V(document) \
@@ skipping 23 matching lines @@
 
 private:
 #define V8_DECLARE_FIELD(name) ScopedPersistent<v8::String> m_##name;
     V8_HIDDEN_VALUES(V8_DECLARE_FIELD);
 #undef V8_DECLARE_FIELD
 };
 
 } // namespace blink
 
 #endif // V8HiddenValue_h