Refactor ZLib and Verbatim encoders.

remoting/jingle_glue/jingle_client.cc

Index: remoting/jingle_glue/jingle_client.cc
diff --git a/remoting/jingle_glue/jingle_client.cc b/remoting/jingle_glue/jingle_client.cc
index 6237629250d17a8a806faf64c8d66bbc9d4f010b..6484e5a8dd0ff9564919552c5567abf7bb10f84d 100644
--- a/remoting/jingle_glue/jingle_client.cc
+++ b/remoting/jingle_glue/jingle_client.cc
@@ -168,6 +168,9 @@ void JingleClient::OnConnectionStateChanged(buzz::XmppEngine::State state) {
       break;
     case buzz::XmppEngine::STATE_CLOSED:
       UpdateState(CLOSED);
+      // Client is destroyed by the TaskRunner after the client is
+      // closed. Reset the pointer so we don't try to use it later.
+      client_ = NULL;
       break;
     default:
       NOTREACHED();