DecreaseKeyboardBrightness 23 ash/system/chromeos/keyboard_brightness_controller.cc DecreaseKeyboardBrightness(); DecreaseKeyboardBrightness 52 chromeos/dbus/fake_power_manager_client.h virtual void DecreaseKeyboardBrightness() OVERRIDE; DecreaseKeyboardBrightness 110 chromeos/dbus/power_manager_client.h virtual void DecreaseKeyboardBrightness() = 0;