GTTF: Add missing virtual destructors.

ipc/ipc_channel_proxy.h

 // Copyright (c) 2012 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 IPC_IPC_CHANNEL_PROXY_H_
 #define IPC_IPC_CHANNEL_PROXY_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 98 matching lines @@
   };
 
 
   // Interface for a filter to be imposed on outgoing messages which can
   // re-write the message.  Used mainly for testing.
   class OutgoingMessageFilter {
    public:
     // Returns a re-written message, freeing the original, or simply the
     // original unchanged if no rewrite indicated.
     virtual Message *Rewrite(Message *message) = 0;
+
+   protected:
+    virtual ~OutgoingMessageFilter() { }
   };
 
   // Initializes a channel proxy.  The channel_handle and mode parameters are
   // passed directly to the underlying IPC::Channel.  The listener is called on
   // the thread that creates the ChannelProxy.  The filter's OnMessageReceived
   // method is called on the thread where the IPC::Channel is running.  The
   // filter may be null if the consumer is not interested in handling messages
   // on the background thread.  Any message not handled by the filter will be
   // dispatched to the listener.  The given task runner correspond to a thread
   // on which IPC::Channel is created and used (e.g. IO thread).
@@ skipping 155 matching lines @@
 
   OutgoingMessageFilter* outgoing_message_filter_;
 
   // Whether the channel has been initialized.
   bool did_init_;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_PROXY_H_