Proxy PPB_Var, fix o-o-p string var id tracking.

ppapi/proxy/ppb_var_deprecated_proxy.h

 // Copyright (c) 2011 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_PPB_VAR_PROXY_H_
-#define PPAPI_PPB_VAR_PROXY_H_
+#ifndef PPAPI_PPB_VAR_DEPRECATED_PROXY_H_
+#define PPAPI_PPB_VAR_DEPRECATED_PROXY_H_
 
 #include <vector>
 
 #include "base/task.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_Var_Deprecated;
 
 namespace pp {
 namespace proxy {
 
 class SerializedVar;
 class SerializedVarArray;
 class SerializedVarReceiveInput;
 class SerializedVarVectorOutParam;
 class SerializedVarVectorReceiveInput;
 class SerializedVarOutParam;
 class SerializedVarReturnValue;
 
 class PPB_Var_Deprecated_Proxy : public InterfaceProxy {
  public:
   PPB_Var_Deprecated_Proxy(Dispatcher* dispatcher,
                            const void* target_interface);
   virtual ~PPB_Var_Deprecated_Proxy();
 
   static const Info* GetInfo();
 
   const PPB_Var_Deprecated* ppb_var_target() const {
-    return reinterpret_cast<const PPB_Var_Deprecated*>(target_interface());
+    return static_cast<const PPB_Var_Deprecated*>(target_interface());
   }
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
   void OnMsgAddRefObject(int64 object_id, int* unused);
   void OnMsgReleaseObject(int64 object_id);
   void OnMsgHasProperty(SerializedVarReceiveInput var,
@@ skipping 47 matching lines @@
   // Call in the host for messages that can be reentered.
   void SetAllowPluginReentrancy();
 
   void DoReleaseObject(int64 object_id);
   ScopedRunnableMethodFactory<PPB_Var_Deprecated_Proxy> task_factory_;
 };
 
 }  // namespace proxy
 }  // namespace pp
 
-#endif  // PPAPI_PPB_VAR_PROXY_H_
+#endif  // PPAPI_PPB_VAR_DEPRECATED_PROXY_H_