Mojo: Move system embedder API files to mojo/system/embedder.

mojo/system/channel.h

 // Copyright 2013 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_CHANNEL_H_
 #define MOJO_SYSTEM_CHANNEL_H_
 
 #include <stdint.h>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "mojo/public/system/core.h"
+#include "mojo/system/embedder/scoped_platform_handle.h"
 #include "mojo/system/message_in_transit.h"
 #include "mojo/system/message_pipe.h"
 #include "mojo/system/raw_channel.h"
-#include "mojo/system/scoped_platform_handle.h"
 #include "mojo/system/system_impl_export.h"
 
 namespace base {
 class MessageLoop;
 }
 
 namespace mojo {
 namespace system {
 
 // This class is mostly thread-safe. It must be created on an "I/O thread" (see
@@ skipping 104 matching lines @@
   // be checked for existence before use.
   MessageInTransit::EndpointId next_local_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Channel);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_CHANNEL_H_