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

mojo/mojo_edk.gypi

 # Copyright 2016 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.
 
 {
   'variables': {
     'mojo_edk_ports_sources': [
       'edk/system/ports/event.cc',
       'edk/system/ports/event.h',
       'edk/system/ports/message.cc',
@@ skipping 27 matching lines @@
       'edk/embedder/platform_channel_utils_posix.cc',
       'edk/embedder/platform_channel_utils_posix.h',
       'edk/embedder/platform_handle.cc',
       'edk/embedder/platform_handle.h',
       'edk/embedder/platform_handle_utils.h',
       'edk/embedder/platform_handle_utils_posix.cc',
       'edk/embedder/platform_handle_utils_win.cc',
       'edk/embedder/platform_handle_vector.h',
       'edk/embedder/platform_shared_buffer.cc',
       'edk/embedder/platform_shared_buffer.h',
+      'edk/embedder/scoped_ipc_support.cc',
+      'edk/embedder/scoped_ipc_support.h',
       'edk/embedder/scoped_platform_handle.h',
       'edk/system/awakable.h',
       'edk/system/awakable_list.cc',
       'edk/system/awakable_list.h',
       'edk/system/async_waiter.cc',
       'edk/system/async_waiter.h',
       'edk/system/atomic_flag.h',
       'edk/system/broker.h',
       'edk/system/broker_host.h',
       'edk/system/channel.cc',
@@ skipping 48 matching lines @@
       'edk/embedder/test_embedder.h',
     ],
     'mojo_edk_system_impl_non_nacl_sources': [
       'edk/system/broker_host_posix.cc',
       'edk/system/broker_posix.cc',
       'edk/system/channel_posix.cc',
       'edk/system/remote_message_pipe_bootstrap.cc',
     ],
   },
 }