Mojo: Move platform handle/channel stuff in system to embedder namespace.

mojo/system/embedder.h

 // 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.
 
 #ifndef MOJO_SYSTEM_EMBEDDER_H_
 #define MOJO_SYSTEM_EMBEDDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_runner.h"
@@ skipping 25 matching lines @@
 // immediately written to the returned handle and the handle closed, all before
 // the channel has begun operation on the IO thread. In this case, the channel
 // is expected to connect as usual, send the queued message, and report that the
 // handle was closed to the other side. (This message may well contain another
 // handle, so there may well still be message pipes "on" this channel.)
 //
 // TODO(vtl): Figure out channel teardown.
 struct ChannelInfo;
 typedef base::Callback<void(ChannelInfo*)> DidCreateChannelOnIOThreadCallback;
 MOJO_SYSTEM_IMPL_EXPORT MojoHandle CreateChannel(
-    system::ScopedPlatformHandle platform_handle,
+    ScopedPlatformHandle platform_handle,
     scoped_refptr<base::TaskRunner> io_thread_task_runner,
     DidCreateChannelOnIOThreadCallback callback);
 
 MOJO_SYSTEM_IMPL_EXPORT void DestroyChannelOnIOThread(
     ChannelInfo* channel_info);
 
 }  // namespace embedder
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_EMBEDDER_H_