Remove usage of FOR_EACH_OBSERVER macro in ash/

ash/common/keyboard/keyboard_ui.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/common/keyboard/keyboard_ui.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/keyboard/keyboard_ui_observer.h"
 #include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
@@ skipping 28 matching lines @@
   }
 
   // AccessibilityObserver:
   void OnAccessibilityModeChanged(
       AccessibilityNotificationVisibility notify) override {
     bool enabled = IsEnabled();
     if (enabled_ == enabled)
       return;
 
     enabled_ = enabled;
-    FOR_EACH_OBSERVER(KeyboardUIObserver, *observers(),
-                      OnKeyboardEnabledStateChanged(enabled));
+    for (auto& observer : *observers())
+      observer.OnKeyboardEnabledStateChanged(enabled);
   }
 
  private:
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardUIImpl);
 };
 
 KeyboardUI::~KeyboardUI() {}
 
 // static
 std::unique_ptr<KeyboardUI> KeyboardUI::Create() {
   return base::WrapUnique(new KeyboardUIImpl);
 }
 
 void KeyboardUI::AddObserver(KeyboardUIObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void KeyboardUI::RemoveObserver(KeyboardUIObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 KeyboardUI::KeyboardUI() {}
 
 }  // namespace ash