Remove usage of FOR_EACH_OBSERVER macro in ash/

ash/display/display_manager.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 "ash/display/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <map>
@@ skipping 1391 matching lines @@
                             kMinimumOverlapForInvalidOffset);
 }
 
 void DisplayManager::RunPendingTasksForTest() {
   if (!software_mirroring_display_list_.empty())
     base::RunLoop().RunUntilIdle();
 }
 
 void DisplayManager::NotifyMetricsChanged(const display::Display& display,
                                           uint32_t metrics) {
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayMetricsChanged(display, metrics));
+  for (auto& observer : observers_)
+    observer.OnDisplayMetricsChanged(display, metrics);
 }
 
 void DisplayManager::NotifyDisplayAdded(const display::Display& display) {
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayAdded(display));
+  for (auto& observer : observers_)
+    observer.OnDisplayAdded(display);
 }
 
 void DisplayManager::NotifyDisplayRemoved(const display::Display& display) {
-  FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
-                    OnDisplayRemoved(display));
+  for (auto& observer : observers_)
+    observer.OnDisplayRemoved(display);
 }
 
 void DisplayManager::AddObserver(display::DisplayObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void DisplayManager::RemoveObserver(display::DisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 const display::Display& DisplayManager::GetSecondaryDisplay() const {
   CHECK_LE(2U, GetNumDisplays());
   return GetDisplayAt(0).id() ==
                  display::Screen::GetScreen()->GetPrimaryDisplay().id()
              ? GetDisplayAt(1)
              : GetDisplayAt(0);
 }
 
 }  // namespace ash