Switch to standard integer types in ppapi/.

ppapi/tests/test_message_handler.cc

 // Copyright 2014 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.
 
 #include "ppapi/tests/test_message_handler.h"
 
+#include <stddef.h>
+#include <stdint.h>
 #include <string.h>
 #include <algorithm>
 #include <map>
 #include <sstream>
 
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/c/ppb_messaging.h"
 #include "ppapi/c/ppp_message_handler.h"
 #include "ppapi/cpp/completion_callback.h"
@@ skipping 344 matching lines @@
 }
 
 pp::Var TestMessageHandler::WaitForMessage() {
   message_received_.Wait();
   pp::Var var_to_return = last_message_;
   last_message_ = pp::Var();
   message_received_.Reset();
   return var_to_return;
 }