[api] deprecate v8::Function::IsBuiltin.

include/v8.h

 // 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 3677 matching lines @@
   int GetScriptLineNumber() const;
   /**
    * Returns zero based column number of function body and
    * kLineOffsetNotFound if no information available.
    */
   int GetScriptColumnNumber() const;
 
   /**
    * Tells whether this function is builtin.
    */
-  bool IsBuiltin() const;
+  V8_DEPRECATED("this should no longer be used.", bool IsBuiltin() const);
 
   /**
    * Returns scriptId.
    */
   int ScriptId() const;
 
   /**
    * Returns the original function if this function is bound, else returns
    * v8::Undefined.
    */
@@ skipping 5979 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_