Revert "Integrate NaCl Head - Revert 69309 to restore 64b handles in PPAPI"

ppapi/c/pp_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_C_PP_INSTANCE_H_
 #define PPAPI_C_PP_INSTANCE_H_
 
 /**
  * @file
  * Defines the API ...
  *
  * @addtogroup PP
  * @{
  */
 
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_stdint.h"
 
 /** A PP_Instance uniquely identifies one plugin instance, which is one time
  * that a page says \<embed>. There can be multiple instances of the same plugin
  * type on a page that will all be in the same module.
  *
  * The identifier is an opaque handle assigned by the browser to the plugin. It
  * is guaranteed never to be 0, so a plugin can initialize it to 0 to
  * indicate a "NULL handle."
  */
-typedef int64_t PP_Instance;
-PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_Instance, 8);
+typedef int32_t PP_Instance;
+PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_Instance, 4);
 
 /**
  * @}
  * End addtogroup PP
  */
 
 #endif  /* PPAPI_C_PP_INSTANCE_H_ */