Remove usage of FOR_EACH_OBSERVER macro in blimp

blimp/engine/app/settings_manager.cc

 // Copyright 2016 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 <blimp/engine/app/settings_manager.h>
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/web_preferences.h"
 
 namespace blimp {
 namespace engine {
@@ skipping 25 matching lines @@
 const EngineSettings& SettingsManager::GetEngineSettings() const {
   return settings_;
 }
 
 void SettingsManager::UpdateEngineSettings(const EngineSettings& settings) {
   EngineSettings old_settings = settings_;
   settings_ = settings;
 
   if (settings_.record_whole_document != old_settings.record_whole_document) {
     // Notify the observers that the web preferences have changed.
-    FOR_EACH_OBSERVER(Observer, observer_list_, OnWebPreferencesChanged());
+    for (auto& observer : observer_list_)
+      observer.OnWebPreferencesChanged();
   }
 }
 
 }  // namespace engine
 }  // namespace blimp