Implement support for route change notifications in the Transport interface.

jingle/glue/channel_socket_adapter.h

Index: jingle/glue/channel_socket_adapter.h
diff --git a/jingle/glue/channel_socket_adapter.h b/jingle/glue/channel_socket_adapter.h
index ab78c9ce7739663a8f2fe278481cb32e9b6c41ce..a39ef605fe5153bd91c91faf0fddd1dbb25fea47 100644
--- a/jingle/glue/channel_socket_adapter.h
+++ b/jingle/glue/channel_socket_adapter.h
@@ -29,7 +29,9 @@ class TransportChannelSocketAdapter : public net::Socket,
   explicit TransportChannelSocketAdapter(cricket::TransportChannel* channel);
   virtual ~TransportChannelSocketAdapter();
 
-  // Sets callback that should be called when the adapter is being destroyed.
+  // Sets callback that should be called when the adapter is being
+  // destroyed. The callback is not allowed to touch the adapter, but
+  // can do anything else, e.g. destroy the TransportChannel.
   void SetOnDestroyedCallback(const base::Closure& callback);
 
   // Closes the stream. |error_code| specifies error code that will