Extract kArcEnabled preference from ArcSessionManager part 2.

chrome/browser/chromeos/arc/arc_service_launcher.h

Index: chrome/browser/chromeos/arc/arc_service_launcher.h
diff --git a/chrome/browser/chromeos/arc/arc_service_launcher.h b/chrome/browser/chromeos/arc/arc_service_launcher.h
index 8fef6c1ab26185306e6f05b1c5b424177e1d313e..2c8132ef3881e194199b61c0dadc9345dc1d5393 100644
--- a/chrome/browser/chromeos/arc/arc_service_launcher.h
+++ b/chrome/browser/chromeos/arc/arc_service_launcher.h
@@ -13,6 +13,7 @@ class Profile;
 
 namespace arc {
 
+class ArcPlayStoreEnabledPreferenceHandler;
 class ArcServiceManager;
 class ArcSessionManager;
 
@@ -38,6 +39,8 @@ class ArcServiceLauncher {
  private:
   std::unique_ptr<ArcServiceManager> arc_service_manager_;
   std::unique_ptr<ArcSessionManager> arc_session_manager_;
+  std::unique_ptr<ArcPlayStoreEnabledPreferenceHandler>
+      arc_play_store_enabled_preference_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcServiceLauncher);
 };