Switch to standard integer types in ppapi/.

ppapi/tests/extensions/media_galleries/test_galleries.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 <stdint.h>
+
 #include <string>
 
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/cpp/file_io.h"
 #include "ppapi/cpp/file_ref.h"
 #include "ppapi/cpp/file_system.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi/cpp/var_dictionary.h"
@@ skipping 142 matching lines @@
   }
 };
 
 namespace pp {
 
 Module* CreateModule() {
   return new FilePassingModule();
 }
 
 }  // namespace pp