Fix memory leak in IPC::ChannelProxy

ipc/ipc_channel_proxy.h

Index: ipc/ipc_channel_proxy.h
===================================================================
--- ipc/ipc_channel_proxy.h	(revision 21433)
+++ ipc/ipc_channel_proxy.h	(working copy)
@@ -14,6 +14,8 @@
 
 namespace IPC {
 
+class SendTask;
+
 //-----------------------------------------------------------------------------
 // IPC::ChannelProxy
 //
@@ -174,6 +176,7 @@
 
    private:
     friend class ChannelProxy;
+    friend class SendTask;
     // Create the Channel
     void CreateChannel(const std::string& id, const Channel::Mode& mode);
 
@@ -199,6 +202,8 @@
   Context* context() { return context_; }
 
  private:
+  friend class SendTask;
+
   void Init(const std::string& channel_id, Channel::Mode mode,
             MessageLoop* ipc_thread_loop, bool create_pipe_now);