Speculative fix for a leak in SyncChannel.

ipc/ipc_sync_channel.h

 // Copyright (c) 2006-2008 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_SYNC_SENDER_H__
 #define IPC_IPC_SYNC_SENDER_H__
 
 #include <string>
 #include <deque>
 
@@ skipping 18 matching lines @@
 // is more than this object.  If the message loop goes away while this object
 // is running and it's used to send a message, then it will use the invalid
 // message loop pointer to proxy it to the ipc thread.
 class SyncChannel : public ChannelProxy,
                     public base::WaitableEventWatcher::Delegate {
  public:
   SyncChannel(const std::string& channel_id, Channel::Mode mode,
               Channel::Listener* listener, MessageFilter* filter,
               MessageLoop* ipc_message_loop, bool create_pipe_now,
               base::WaitableEvent* shutdown_event);
-  ~SyncChannel();
+  virtual ~SyncChannel();
 
   virtual bool Send(Message* message);
   virtual bool SendWithTimeout(Message* message, int timeout_ms);
 
   // Whether we allow sending messages with no time-out.
   void set_sync_messages_with_no_timeout_allowed(bool value) {
     sync_messages_with_no_timeout_allowed_ = value;
   }
 
  protected:
@@ skipping 103 matching lines @@
   // Used to signal events between the IPC and listener threads.
   base::WaitableEventWatcher send_done_watcher_;
   base::WaitableEventWatcher dispatch_watcher_;
 
   DISALLOW_EVIL_CONSTRUCTORS(SyncChannel);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_SYNC_SENDER_H__