Change a parameter name from message_data to message based on a review comment from http://codere...

ppapi/cpp/instance.h

 // Copyright (c) 2010 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 PPAPI_CPP_INSTANCE_H_
 #define PPAPI_CPP_INSTANCE_H_
 
 /**
  * @file
  * Defines the API ...
@@ skipping 84 matching lines @@
   bool IsFullFrame();
 
   /** See PPB_Instance.ExecuteScript. */
   Var ExecuteScript(const Var& script, Var* exception = NULL);
 
   // These functions use the PPP_Messaging and PPB_Messaging interfaces, so that
   // messaging can be done conveniently for a pp::Instance without using a
   // separate C++ class.
 
   /** See PPP_Messaging.HandleMessage. */
-  virtual void HandleMessage(const Var& message_data);
+  virtual void HandleMessage(const Var& message);
   /** See PPB_Messaging.PostMessage. */
   void PostMessage(const Var& message);
 
   // @}
 
   /**
    * Associates a plugin instance with an interface,
    * creating an object... {PENDING: clarify!}
    *
    * Many optional interfaces are associated with a plugin instance. For
@@ skipping 44 matching lines @@
   InterfaceNameToObjectMap interface_name_to_objects_;
 };
 
 }  // namespace pp
 
 /**
  * @}
  * End addtogroup CPP
  */
 #endif  // PPAPI_CPP_INSTANCE_H_