Switch to standard integer types in ppapi/.

ppapi/thunk/ppb_x509_certificate_private_api.h

 // Copyright (c) 2012 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_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_
 #define PPAPI_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_
 
+#include <stdint.h>
+
 #include "ppapi/c/private/ppb_x509_certificate_private.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
 namespace thunk {
 
 class PPAPI_THUNK_EXPORT PPB_X509Certificate_Private_API {
  public:
   virtual ~PPB_X509Certificate_Private_API() {}
 
   virtual PP_Bool Initialize(const char* bytes, uint32_t length) = 0;
   virtual PP_Var GetField(PP_X509Certificate_Private_Field field) = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_