Fix XmppLoginHandler to handle destruction from delegate methods.

remoting/signaling/xmpp_login_handler.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/signaling/xmpp_login_handler.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "remoting/signaling/xmpp_stream_parser.h"
@@ skipping 203 matching lines @@
              "xmlns:auth=\"http://www.google.com/talk/protocol/auth\">" +
         cookie +
       "</auth>");
 };
 
 void XmppLoginHandler::OnParserError() {
   OnError(SignalStrategy::PROTOCOL_ERROR);
 }
 
 void XmppLoginHandler::StartStream(const std::string& first_message) {
+  stream_parser_.reset(new XmppStreamParser());
+  stream_parser_->SetCallbacks(
+      base::Bind(&XmppLoginHandler::OnStanza, base::Unretained(this)),
+      base::Bind(&XmppLoginHandler::OnParserError, base::Unretained(this)));
   delegate_->SendMessage("<stream:stream to=\"" + server_ +
                          "\" version=\"1.0\" xmlns=\"jabber:client\" "
                          "xmlns:stream=\"http://etherx.jabber.org/streams\">" +
                          first_message);
-  stream_parser_.reset(new XmppStreamParser());
-  stream_parser_->SetCallbacks(
-      base::Bind(&XmppLoginHandler::OnStanza, base::Unretained(this)),
-      base::Bind(&XmppLoginHandler::OnParserError, base::Unretained(this)));
 }
 
 void XmppLoginHandler::OnError(SignalStrategy::Error error) {
   if (state_ != State::ERROR) {
     state_ = State::ERROR;
     delegate_->OnLoginHandlerError(error);
   }
 }
 
 }  // namespace remoting