mash: Migrate [Keyboard]Brightness code to ash/common.

ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h

Index: ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h
diff --git a/ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h b/ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h
deleted file mode 100644
index 90bb2851fb1c631c3e71001aaf9e662ae6a3b277..0000000000000000000000000000000000000000
--- a/ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h
+++ /dev/null
@@ -1,29 +0,0 @@
-// 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.
-
-#ifndef ASH_SYSTEM_KEYBOARD_BRIGHTNESS_KEYBOARD_BRIGHTNESS_CONTROL_DELEGATE_H_
-#define ASH_SYSTEM_KEYBOARD_BRIGHTNESS_KEYBOARD_BRIGHTNESS_CONTROL_DELEGATE_H_
-
-namespace ui {
-class Accelerator;
-}  // namespace ui
-
-namespace ash {
-
-// Delegate for controlling the keyboard brightness.
-class KeyboardBrightnessControlDelegate {
- public:
-  virtual ~KeyboardBrightnessControlDelegate() {}
-
-  // Handles an accelerator-driven request to decrease or increase the keyboard
-  // brightness.
-  virtual void HandleKeyboardBrightnessDown(
-      const ui::Accelerator& accelerator) = 0;
-  virtual void HandleKeyboardBrightnessUp(
-      const ui::Accelerator& accelerator) = 0;
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_KEYBOARD_BRIGHTNESS_KEYBOARD_BRIGHTNESS_CONTROL_DELEGATE_H_