ui/views: convert usage of FOR_EACH_OBSERVER macro

ui/views/focus/widget_focus_manager.cc

 // Copyright (c) 2011 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 "ui/views/focus/widget_focus_manager.h"
 
 #include "base/memory/singleton.h"
 
 namespace views {
 
 // WidgetFocusManager ----------------------------------------------------------
 
 // static
 WidgetFocusManager* WidgetFocusManager::GetInstance() {
   return base::Singleton<WidgetFocusManager>::get();
 }
 
 void WidgetFocusManager::AddFocusChangeListener(
     WidgetFocusChangeListener* listener) {
   focus_change_listeners_.AddObserver(listener);
 }
 
 void WidgetFocusManager::RemoveFocusChangeListener(
     WidgetFocusChangeListener* listener) {
   focus_change_listeners_.RemoveObserver(listener);
 }
 
 void WidgetFocusManager::OnNativeFocusChanged(gfx::NativeView focused_now) {
   if (enabled_) {
-    FOR_EACH_OBSERVER(WidgetFocusChangeListener, focus_change_listeners_,
-                      OnNativeFocusChanged(focused_now));
+    for (WidgetFocusChangeListener& observer : focus_change_listeners_)
+      observer.OnNativeFocusChanged(focused_now);
   }
 }
 
 WidgetFocusManager::WidgetFocusManager() : enabled_(true) {}
 
 WidgetFocusManager::~WidgetFocusManager() {}
 
 // AutoNativeNotificationDisabler ----------------------------------------------
 
 AutoNativeNotificationDisabler::AutoNativeNotificationDisabler() {
   WidgetFocusManager::GetInstance()->DisableNotifications();
 }
 
 AutoNativeNotificationDisabler::~AutoNativeNotificationDisabler() {
   WidgetFocusManager::GetInstance()->EnableNotifications();
 }
 
 }  // namespace views