Revert "Move mojo edk into mojo/edk"

mojo/edk/embedder/platform_handle_utils_win.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 "mojo/edk/embedder/platform_handle_utils.h"
-
-#include <windows.h>
-
-#include "base/logging.h"
-
-namespace mojo {
-namespace embedder {
-
-ScopedPlatformHandle DuplicatePlatformHandle(PlatformHandle platform_handle) {
-  DCHECK(platform_handle.is_valid());
-
-  HANDLE new_handle;
-  if (!DuplicateHandle(GetCurrentProcess(),
-                       platform_handle.handle,
-                       GetCurrentProcess(),
-                       &new_handle,
-                       0,
-                       TRUE,
-                       DUPLICATE_SAME_ACCESS))
-    return ScopedPlatformHandle();
-  DCHECK_NE(new_handle, INVALID_HANDLE_VALUE);
-  return ScopedPlatformHandle(PlatformHandle(new_handle));
-}
-
-}  // namespace embedder
-}  // namespace mojo