chromeos: Remove --ash-enable-brightness-control flag.

ash/ash_switches.h

 // 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_ASH_SWITCHES_H_
 #define ASH_ASH_SWITCHES_H_
 
 #include "ash/ash_export.h"
 
 #include "build/build_config.h"
@@ skipping 10 matching lines @@
 ASH_EXPORT extern const char kAshConstrainPointerToRoot[];
 ASH_EXPORT extern const char kAshCopyHostBackgroundAtBoot[];
 ASH_EXPORT extern const char kAshDebugShortcuts[];
 ASH_EXPORT extern const char kAshDefaultWallpaperIsOem[];
 ASH_EXPORT extern const char kAshDefaultWallpaperLarge[];
 ASH_EXPORT extern const char kAshDefaultWallpaperSmall[];
 ASH_EXPORT extern const char kAshDisableAlternateFrameCaptionButtonStyle[];
 ASH_EXPORT extern const char kAshDisableAlternateShelfLayout[];
 ASH_EXPORT extern const char kAshDisableDockedWindows[];
 ASH_EXPORT extern const char kAshEnableAlternateFrameCaptionButtonStyle[];
-ASH_EXPORT extern const char kAshEnableBrightnessControl[];
 #if defined(OS_CHROMEOS)
 ASH_EXPORT extern const char kAshEnableMagnifierKeyScroller[];
 ASH_EXPORT extern const char kAshEnableMultiUserTray[];
 #endif
 ASH_EXPORT extern const char kAshEnableSoftwareMirroring[];
 ASH_EXPORT extern const char kAshEnableSystemSounds[];
 ASH_EXPORT extern const char kAshEnableTouchViewTesting[];
 ASH_EXPORT extern const char kAshEnableTrayDragging[];
 ASH_EXPORT extern const char kAshGuestWallpaperLarge[];
 ASH_EXPORT extern const char kAshGuestWallpaperSmall[];
@@ skipping 24 matching lines @@
 #if defined(OS_CHROMEOS)
 // Returns true if a notification should appear when a low-power USB charger
 // is connected.
 ASH_EXPORT bool UseUsbChargerNotification();
 #endif
 
 }  // namespace switches
 }  // namespace ash
 
 #endif  // ASH_ASH_SWITCHES_H_