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

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