Remove usage of FOR_EACH_OBSERVER macro in ash/

ash/mus/bridge/wm_shell_mus.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/mus/bridge/wm_shell_mus.h"
 
 #include <utility>
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/key_event_watcher.h"
@@ skipping 362 matching lines @@
   return base::MakeUnique<ImmersiveFullscreenController>();
 }
 
 std::unique_ptr<KeyEventWatcher> WmShellMus::CreateKeyEventWatcher() {
   // TODO: needs implementation for mus, http://crbug.com/649600.
   NOTIMPLEMENTED();
   return std::unique_ptr<KeyEventWatcher>();
 }
 
 void WmShellMus::OnOverviewModeStarting() {
-  FOR_EACH_OBSERVER(ShellObserver, *shell_observers(),
-                    OnOverviewModeStarting());
+  for (auto& observer : *shell_observers())
+    observer.OnOverviewModeStarting();
 }
 
 void WmShellMus::OnOverviewModeEnded() {
-  FOR_EACH_OBSERVER(ShellObserver, *shell_observers(), OnOverviewModeEnded());
+  for (auto& observer : *shell_observers())
+    observer.OnOverviewModeEnded();
 }
 
 SessionStateDelegate* WmShellMus::GetSessionStateDelegate() {
   return session_state_delegate_.get();
 }
 
 void WmShellMus::AddActivationObserver(WmActivationObserver* observer) {
   activation_observers_.AddObserver(observer);
 }
 
@@ skipping 51 matching lines @@
 void WmShellMus::OnWindowTreeFocusChanged(ui::Window* gained_focus,
                                           ui::Window* lost_focus) {
   WmWindow* gained_active = GetToplevelAncestor(gained_focus);
   if (gained_active)
     set_root_window_for_new_windows(gained_active->GetRootWindow());
 
   WmWindow* lost_active = GetToplevelAncestor(lost_focus);
   if (gained_active == lost_active)
     return;
 
-  FOR_EACH_OBSERVER(WmActivationObserver, activation_observers_,
-                    OnWindowActivated(gained_active, lost_active));
+  for (auto& observer : activation_observers_)
+    observer.OnWindowActivated(gained_active, lost_active);
 }
 
 void WmShellMus::OnDidDestroyClient(ui::WindowTreeClient* client) {
   DCHECK_EQ(window_tree_client(), client);
   client->RemoveObserver(this);
 }
 
 }  // namespace mus
 }  // namespace ash