Revert of Adds thunks for getting platform handles

mojo/platform_handle/platform_handle_exports.h

Index: mojo/platform_handle/platform_handle_exports.h
diff --git a/mojo/platform_handle/platform_handle_exports.h b/mojo/platform_handle/platform_handle_exports.h
deleted file mode 100644
index 6c57f9b07dccb970335ba2010bb9966e8a49d936..0000000000000000000000000000000000000000
--- a/mojo/platform_handle/platform_handle_exports.h
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2015 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 MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_EXPORTS_H_
-#define MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_EXPORTS_H_
-
-#if defined(COMPONENT_BUILD) && defined(MOJO_USE_SYSTEM_IMPL)
-#if defined(WIN32)
-
-#if defined(PLATFORM_HANDLE_IMPLEMENTATION)
-#define PLATFORM_HANDLE_EXPORT __declspec(dllexport)
-#else
-#define PLATFORM_HANDLE_EXPORT __declspec(dllimport)
-#endif
-
-#else  // !defined(WIN32)
-
-#if defined(PLATFORM_HANDLE_IMPLEMENTATION)
-#define PLATFORM_HANDLE_EXPORT __attribute__((visibility("default")))
-#else
-#define PLATFORM_HANDLE_EXPORT
-#endif
-
-#endif  // defined(WIN32)
-
-#else  // !defined(COMPONENT_BUILD) || !defined(MOJO_USE_SYSTEM_IMPL)
-
-#define PLATFORM_HANDLE_EXPORT
-
-#endif  // defined(COMPONENT_BUILD) && defined(MOJO_USE_SYSTEM_IMPL)
-
-#endif  // MOJO_PLATFORM_HANDLE_PLATFORM_HANDLE_EXPORTS_H_