DecreaseScreenBrightness   22 ash/system/chromeos/brightness/brightness_controller_chromeos.cc       DecreaseScreenBrightness(true);
DecreaseScreenBrightness   46 chromeos/dbus/fake_power_manager_client.h   virtual void DecreaseScreenBrightness(bool allow_off) OVERRIDE;
DecreaseScreenBrightness   95 chromeos/dbus/power_manager_client.h   virtual void DecreaseScreenBrightness(bool allow_off) = 0;