Move ScopedIPCSupport to mojo/edk/embedder and the mojo::edk namespace.

ipc/mojo/scoped_ipc_support.h

-// 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 IPC_MOJO_SCOPED_IPC_SUPPORT_H_
-#define IPC_MOJO_SCOPED_IPC_SUPPORT_H_
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/task_runner.h"
-
-namespace IPC {
-
-// Performs any necessary Mojo IPC initialization on construction, and shuts
-// down Mojo IPC on destruction.
-//
-// This should be instantiated once per process and retained as long as Mojo IPC
-// is needed. The TaskRunner passed to the constructor should outlive this
-// object.
-class ScopedIPCSupport {
- public:
-  ScopedIPCSupport(scoped_refptr<base::TaskRunner> io_thread_task_runner);
-  ~ScopedIPCSupport();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ScopedIPCSupport);
-};
-
-}  // namespace IPC
-
-#endif  // IPC_MOJO_SCOPED_IPC_SUPPORT_H_