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

content/browser/service_worker/embedded_worker_instance.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 "content/browser/service_worker/embedded_worker_instance.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
@@ skipping 757 matching lines @@
 void EmbeddedWorkerInstance::Detach() {
   registry_->DetachWorker(process_id(), embedded_worker_id());
   OnDetached();
 }
 
 base::WeakPtr<EmbeddedWorkerInstance> EmbeddedWorkerInstance::AsWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 bool EmbeddedWorkerInstance::OnMessageReceived(const IPC::Message& message) {
-  ListenerList::Iterator it(&listener_list_);
-  while (Listener* listener = it.GetNext()) {
-    if (listener->OnMessageReceived(message))
+  for (auto& listener : listener_list_) {
+    if (listener.OnMessageReceived(message))
       return true;
   }
   return false;
 }
 
 void EmbeddedWorkerInstance::OnReportException(
     const base::string16& error_message,
     int line_number,
     int column_number,
     const GURL& source_url) {
@@ skipping 135 matching lines @@
     case SCRIPT_READ_FINISHED:
       return "Script read finished";
     case STARTING_PHASE_MAX_VALUE:
       NOTREACHED();
   }
   NOTREACHED() << phase;
   return std::string();
 }
 
 }  // namespace content