Remove usage of FOR_EACH_OBSERVER macro in ash/aura

ash/aura/wm_shell_aura.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 "ash/aura/wm_shell_aura.h"
 
 #include <utility>
 
 #include "ash/aura/key_event_watcher_aura.h"
 #include "ash/aura/pointer_watcher_adapter.h"
@@ skipping 290 matching lines @@
 #endif
 
 void WmShellAura::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
     aura::Window* lost_active) {
   WmWindow* gained_active_wm = WmWindowAura::Get(gained_active);
   WmWindow* lost_active_wm = WmWindowAura::Get(lost_active);
   if (gained_active_wm)
     set_root_window_for_new_windows(gained_active_wm->GetRootWindow());
-  FOR_EACH_OBSERVER(WmActivationObserver, activation_observers_,
-                    OnWindowActivated(gained_active_wm, lost_active_wm));
+  for (auto& observer : activation_observers_)
+    observer.OnWindowActivated(gained_active_wm, lost_active_wm);
 }
 
 void WmShellAura::OnAttemptToReactivateWindow(aura::Window* request_active,
                                               aura::Window* actual_active) {
-  FOR_EACH_OBSERVER(
-      WmActivationObserver, activation_observers_,
-      OnAttemptToReactivateWindow(WmWindowAura::Get(request_active),
-                                  WmWindowAura::Get(actual_active)));
+  for (auto& observer : activation_observers_) {
+    observer.OnAttemptToReactivateWindow(WmWindowAura::Get(request_active),
+                                         WmWindowAura::Get(actual_active));
+  }
 }
 
 void WmShellAura::OnDisplayConfigurationChanging() {
-  FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
-                    OnDisplayConfigurationChanging());
+  for (auto& observer : display_observers_)
+    observer.OnDisplayConfigurationChanging();
 }
 
 void WmShellAura::OnDisplayConfigurationChanged() {
-  FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
-                    OnDisplayConfigurationChanged());
+  for (auto& observer : display_observers_)
+    observer.OnDisplayConfigurationChanged();
 }
 
 }  // namespace ash