Switch to standard integer types in ppapi/.

ppapi/shared_impl/platform_file.cc

 // 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.
 
+#include "build/build_config.h"
 #include "ppapi/shared_impl/platform_file.h"
 
 namespace ppapi {
 
 // TODO(piman/brettw): Change trusted interface to return a PP_FileHandle,
 // those casts are ugly.
 base::PlatformFile IntToPlatformFile(int32_t handle) {
 #if defined(OS_WIN)
   return reinterpret_cast<HANDLE>(static_cast<intptr_t>(handle));
 #elif defined(OS_POSIX)
   return handle;
 #else
 #error Not implemented.
 #endif
 }
 
 int32_t PlatformFileToInt(base::PlatformFile handle) {
 #if defined(OS_WIN)
   return static_cast<int32_t>(reinterpret_cast<intptr_t>(handle));
 #elif defined(OS_POSIX)
   return handle;
 #else
 #error Not implemented.
 #endif
 }
 
 }  // namespace ppapi