Make the embedder API use the ChannelManager.

mojo/edk/embedder/channel_info_forward.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.
 
 // This file simply (forward) declares |mojo::embedder::ChannelInfo|, which is
 // meant to be opaque to users of the embedder API.
 
 #ifndef MOJO_EDK_EMBEDDER_CHANNEL_INFO_FORWARD_H_
 #define MOJO_EDK_EMBEDDER_CHANNEL_INFO_FORWARD_H_
 
 namespace mojo {
-
-// Forward declare |system::ChannelInfo|, so that we can typedef it to
-// |embedder::ChannelInfo|. Users of the embedder API shouldn't use this
-// directly; instead they should use |embedder::ChannelInfo|.
-namespace system {
-struct ChannelInfo;
-}
-
 namespace embedder {
 
 // This is an opaque type. The embedder API uses (returns and takes as
 // arguments) pointers to this type. (We don't simply use |void*|, so that
 // custom deleters and such can be used without additional wrappers.
-typedef system::ChannelInfo ChannelInfo;
+struct ChannelInfo;
 
 }  // namespace embedder
-
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_CHANNEL_INFO_FORWARD_H_