Merge definitions of PlatformFileToInt and IntToPlatformFile to one place.

ppapi/shared_impl/platform_file.h

+// 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.
+
+#ifndef PPAPI_SHARED_IMPL_PLATFORM_FILE_H_
+#define PPAPI_SHARED_IMPL_PLATFORM_FILE_H_
+
+#include "base/platform_file.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+
+namespace ppapi {
+
+PPAPI_SHARED_EXPORT base::PlatformFile IntToPlatformFile(int32_t handle);
+PPAPI_SHARED_EXPORT int32_t PlatformFileToInt(base::PlatformFile handle);
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_PLATFORM_FILE_H_