mash: Allow a subset of D-Bus clients to be created in DBusThreadManager

ash/common/system/chromeos/keyboard_brightness_controller.cc

Index: ash/common/system/chromeos/keyboard_brightness_controller.cc
diff --git a/ash/common/system/chromeos/keyboard_brightness_controller.cc b/ash/common/system/chromeos/keyboard_brightness_controller.cc
index 0d2cc1f68b73dd2d5ca58a2987349e6176a4b300..04f062db10fc1e876c6c58d7f64d82103738ef07 100644
--- a/ash/common/system/chromeos/keyboard_brightness_controller.cc
+++ b/ash/common/system/chromeos/keyboard_brightness_controller.cc
@@ -4,8 +4,9 @@
 
 #include "ash/common/system/chromeos/keyboard_brightness_controller.h"
 
+#include "ash/common/dbus_thread_manager_ash.h"
 #include "ash/common/wm_shell.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
+// #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power_manager_client.h"
 #include "ui/base/accelerators/accelerator.h"
 
@@ -18,7 +19,7 @@ void KeyboardBrightnessController::HandleKeyboardBrightnessDown(
         UMA_ACCEL_KEYBOARD_BRIGHTNESS_DOWN_F6);
   }
 
-  chromeos::DBusThreadManager::Get()
+  DBusThreadManagerAsh::Get()
       ->GetPowerManagerClient()
       ->DecreaseKeyboardBrightness();
 }
@@ -30,7 +31,7 @@ void KeyboardBrightnessController::HandleKeyboardBrightnessUp(
         UMA_ACCEL_KEYBOARD_BRIGHTNESS_UP_F7);
   }
 
-  chromeos::DBusThreadManager::Get()
+  DBusThreadManagerAsh::Get()
       ->GetPowerManagerClient()
       ->IncreaseKeyboardBrightness();
 }