Mojo: (Theoretically) implement the read side of platform handle passing.

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"
@@ skipping 129 matching lines @@
 
   friend class base::RefCountedThreadSafe<Channel>;
   virtual ~Channel();
 
   // |RawChannel::Delegate| implementation:
   virtual void OnReadMessage(
       const MessageInTransit::View& message_view) OVERRIDE;
   virtual void OnFatalError(FatalError fatal_error) OVERRIDE;
 
   // Helpers for |OnReadMessage|:
-  bool ValidateReadMessage(const MessageInTransit::View& message_view);
   void OnReadMessageForDownstream(const MessageInTransit::View& message_view);
   void OnReadMessageForChannel(const MessageInTransit::View& message_view);
 
   // Removes the message pipe endpoint with the given local ID, which must exist
   // and be a zombie, and given remote ID. Returns false on failure, in
   // particular if no message pipe with |local_id| is attached.
   bool RemoveMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
                                  MessageInTransit::EndpointId remote_id);
 
   // Handles errors (e.g., invalid messages) from the remote side.
@@ skipping 28 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_