Eliminate a potential race in IPC::ChannelProxy

ipc/ipc_channel_proxy.h

Index: ipc/ipc_channel_proxy.h
diff --git a/ipc/ipc_channel_proxy.h b/ipc/ipc_channel_proxy.h
index dca8c977302975e5fe9a0bf8c7dc188004d97121..2628b3954f762edf9b033ffdc38a5b402286d011 100644
--- a/ipc/ipc_channel_proxy.h
+++ b/ipc/ipc_channel_proxy.h
@@ -251,6 +251,8 @@ class IPC_EXPORT ChannelProxy : public Sender, public base::NonThreadSafe {
     // Cached copy of the peer process ID. Set on IPC but read on both IPC and
     // listener threads.
     base::ProcessId peer_pid_;
+
+    bool channel_is_connected_;
   };
 
   Context* context() { return context_.get(); }