Clean up public interface of AttachmentBrokerUnprivileged.

remoting/host/desktop_process.h

Index: remoting/host/desktop_process.h
diff --git a/remoting/host/desktop_process.h b/remoting/host/desktop_process.h
index e085c6a550c7dfca4b1bd369f254caccf3b63fb8..42467245b098bb6d16d19cfb20081a475ea7a5dd 100644
--- a/remoting/host/desktop_process.h
+++ b/remoting/host/desktop_process.h
@@ -19,7 +19,6 @@
 #include "remoting/host/desktop_session_agent.h"
 
 namespace IPC {
-class AttachmentBrokerUnprivileged;
 class ChannelProxy;
 }  // namespace IPC
 
@@ -77,9 +76,6 @@ class DesktopProcess : public DesktopSessionAgent::Delegate,
   // process.
   std::string daemon_channel_name_;
 
-  // Attachment broker for |daemon_channel_|.
-  scoped_ptr<IPC::AttachmentBrokerUnprivileged> attachment_broker_;
-
   // IPC channel connecting the desktop process with the daemon process.
   scoped_ptr<IPC::ChannelProxy> daemon_channel_;