Clean-up inline members of nested classes (ipc/)

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 cce35f77c0358aa6e5dd057fe6243e21f9dc850f..9755e13d7fb88a1208315be2f7f37273e46f5b93 100644
--- a/ipc/ipc_channel_proxy.h
+++ b/ipc/ipc_channel_proxy.h
@@ -226,7 +226,7 @@ class IPC_EXPORT ChannelProxy : public Sender {
     // Called on the consumers thread when the ChannelProxy is closed.  At that
     // point the consumer is telling us that they don't want to receive any
     // more messages, so we honor that wish by forgetting them!
-    virtual void Clear() { listener_ = NULL; }
+    virtual void Clear();
 
    private:
     friend class ChannelProxy;