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

content/public/test/mock_render_thread.cc

 // Copyright (c) 2012 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/public/test/mock_render_thread.h"
 
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
@@ skipping 251 matching lines @@
 }
 
 // The Frame expects to be returned a valid route_id different from its own.
 void MockRenderThread::OnCreateChildFrame(
     const FrameHostMsg_CreateChildFrame_Params& params,
     int* new_render_frame_id) {
   *new_render_frame_id = new_frame_routing_id_++;
 }
 
 bool MockRenderThread::OnControlMessageReceived(const IPC::Message& msg) {
-  base::ObserverListBase<RenderThreadObserver>::Iterator it(&observers_);
-  RenderThreadObserver* observer;
-  while ((observer = it.GetNext()) != NULL) {
-    if (observer->OnControlMessageReceived(msg))
+  for (auto& observer : observers_) {
+    if (observer.OnControlMessageReceived(msg))
       return true;
   }
   return OnMessageReceived(msg);
 }
 
 bool MockRenderThread::OnMessageReceived(const IPC::Message& msg) {
   // Save the message in the sink.
   sink_.OnMessageReceived(msg);
 
   bool handled = true;
@@ skipping 19 matching lines @@
 void MockRenderThread::OnCreateWindow(
     const mojom::CreateNewWindowParams& params,
     mojom::CreateNewWindowReply* reply) {
   reply->route_id = new_window_routing_id_;
   reply->main_frame_route_id = new_window_main_frame_routing_id_;
   reply->main_frame_widget_route_id = new_window_main_frame_widget_routing_id_;
   reply->cloned_session_storage_namespace_id = 0;
 }
 
 }  // namespace content