base: Stop passing a non-const ref to ObserverListBase::Iterator.

remoting/signaling/xmpp_signal_strategy.cc

 // Copyright 2014 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_signal_strategy.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 175 matching lines @@
   if (!xmpp_client_) {
     // If the connection has been terminated then it doesn't matter
     // what Id we return.
     return std::string();
   }
   return xmpp_client_->NextId();
 }
 
 bool XmppSignalStrategy::HandleStanza(const buzz::XmlElement* stanza) {
   DCHECK(CalledOnValidThread());
-  ObserverListBase<Listener>::Iterator it(listeners_);
+  ObserverListBase<Listener>::Iterator it(&listeners_);
   Listener* listener;
   while ((listener = it.GetNext()) != nullptr) {
     if (listener->OnSignalStrategyIncomingStanza(stanza))
       return true;
   }
   return false;
 }
 
 void XmppSignalStrategy::SetAuthInfo(const std::string& username,
                                      const std::string& auth_token) {
@@ skipping 58 matching lines @@
 
 // static
 buzz::PreXmppAuth* XmppSignalStrategy::CreatePreXmppAuth(
     const buzz::XmppClientSettings& settings) {
   buzz::Jid jid(settings.user(), settings.host(), buzz::STR_EMPTY);
   return new notifier::GaiaTokenPreXmppAuth(
       jid.Str(), settings.auth_token(), settings.token_service(), "X-OAUTH2");
 }
 
 }  // namespace remoting