Resolve initialize/destory order between ArcService and ArcSessionManager.

components/arc/arc_service_manager.h

Index: components/arc/arc_service_manager.h
diff --git a/components/arc/arc_service_manager.h b/components/arc/arc_service_manager.h
index 256a1992eb906e9eeac10793e6c46e492ab53e8b..57a00cce6fcb3214358c9a269bc2097714580a1c 100644
--- a/components/arc/arc_service_manager.h
+++ b/components/arc/arc_service_manager.h
@@ -14,8 +14,6 @@
 #include "base/threading/thread_checker.h"
 #include "components/arc/intent_helper/activity_icon_loader.h"
 #include "components/arc/intent_helper/local_activity_resolver.h"
-#include "components/prefs/pref_member.h"
-#include "components/signin/core/account_id/account_id.h"
 
 namespace arc {
 
@@ -41,11 +39,6 @@ class ArcServiceManager {
   // called on the thread that this class was created on.
   static ArcServiceManager* Get();
 
-  // Called when the main profile is initialized after user logs in.
-  void OnPrimaryUserProfilePrepared(
-      const AccountId& account_id,
-      std::unique_ptr<BooleanPrefMember> arc_enabled_pref);
-
   // Called to shut down all ARC services.
   void Shutdown();