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

ash/accelerators/accelerator_controller.cc

 // 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.
 
 #include "ash/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
@@ skipping 1122 matching lines @@
     case PRINT_WINDOW_HIERARCHY:
       return HandlePrintWindowHierarchy();
     default:
       NOTREACHED() << "Unhandled action " << action;
   }
   return false;
 }
 
 void AcceleratorController::SetBrightnessControlDelegate(
     scoped_ptr<BrightnessControlDelegate> brightness_control_delegate) {
-  // Install brightness control delegate only when internal
-  // display exists.
-  if (Shell::GetInstance()->display_manager()->HasInternalDisplay() ||
-      CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kAshEnableBrightnessControl)) {
-    brightness_control_delegate_ = brightness_control_delegate.Pass();
-  }
+  brightness_control_delegate_ = brightness_control_delegate.Pass();
 }
 
 void AcceleratorController::SetImeControlDelegate(
     scoped_ptr<ImeControlDelegate> ime_control_delegate) {
   ime_control_delegate_ = ime_control_delegate.Pass();
 }
 
 void AcceleratorController::SetScreenshotDelegate(
     scoped_ptr<ScreenshotDelegate> screenshot_delegate) {
   screenshot_delegate_ = screenshot_delegate.Pass();
@@ skipping 29 matching lines @@
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash