Remove usage of base::ObserverList<T>::Iter::GetNext() in //remoting.

remoting/signaling/delegating_signal_strategy.cc

 // Copyright 2013 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/delegating_signal_strategy.h"
 
 #include "base/bind.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
@@ skipping 20 matching lines @@
                               weak_factory_.GetWeakPtr(), message));
     return;
   }
 
   std::unique_ptr<buzz::XmlElement> stanza(buzz::XmlElement::ForStr(message));
   if (!stanza.get()) {
     LOG(WARNING) << "Malformed XMPP stanza received: " << message;
     return;
   }
 
-  base::ObserverListBase<Listener>::Iterator it(&listeners_);
-  Listener* listener;
-  while ((listener = it.GetNext()) != nullptr) {
-    if (listener->OnSignalStrategyIncomingStanza(stanza.get()))
+  for (auto& listener : listeners_) {
+    if (listener.OnSignalStrategyIncomingStanza(stanza.get()))
       break;
   }
 }
 
 void DelegatingSignalStrategy::Connect() {
   DCHECK(client_task_runner_->BelongsToCurrentThread());
   FOR_EACH_OBSERVER(Listener, listeners_,
                     OnSignalStrategyStateChange(CONNECTED));
 }
 
@@ skipping 33 matching lines @@
   delegate_task_runner_->PostTask(FROM_HERE,
                                   base::Bind(send_iq_callback_, stanza->Str()));
   return true;
 }
 
 std::string DelegatingSignalStrategy::GetNextId() {
   return base::Uint64ToString(base::RandUint64());
 }
 
 }  // namespace remoting