Migrate ArcUserDataService into ArcAuthService.

chrome/browser/chromeos/arc/arc_auth_service.h

Index: chrome/browser/chromeos/arc/arc_auth_service.h
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.h b/chrome/browser/chromeos/arc/arc_auth_service.h
index 3466f886ad1a252bc28ddfc88d673d6b26ed6c4e..3e726990a9342be916c343b7cd32aafa3327d5d2 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.h
+++ b/chrome/browser/chromeos/arc/arc_auth_service.h
@@ -181,6 +181,15 @@ class ArcAuthService : public ArcService,
   // Stops ARC without changing ArcEnabled preference.
   void StopArc();
 
+  // If arc is running, StopArc(), then StartArc(). Between them
+  // data clear may happens.
+  void ReenableArc();

[Luis Héctor Chávez, 2016/08/09 16:40:02]

How about calling this "RestartArc()"? Also, the documentation seems a bit
inaccurate, since you assert if ARC is not running. How about "Calls StopArc()
followed by StartArc(). When ARC is stopped, data wiping will occur if it was
scheduled. This must be called only when ARC is running".

[hidehiko, 2016/08/10 05:41:19]

Can we keep the name? The comment was wrong and fixed in the latest PS. Sorry
for confusion.

+
+  // Removes the data if ARC is stopped. Otherwise, queue to remove the data
+  // on ARC is stopped.
+  void RemoveArcData();

[Luis Héctor Chávez, 2016/08/09 16:40:02]

How about to make this less confusing, call this "ScheduleArcDataWipe()", and
require it to be called when ARC is running. IIUC you only call it while ARC is
stopped just in one place.

[hidehiko, 2016/08/10 05:41:19]

This does not actually "schedule" but remove the data. If ARC is running, it is
just postponed, I think. And actually it can be called while ARC is stopped.
WDYT?

+  void OnArcDataRemoved(bool success);

[khmel, 2016/08/09 15:23:11]

it seems, it can be private

[hidehiko, 2016/08/10 05:41:19]

Done.

+
   // Returns current page that has to be shown in OptIn UI.
   UIPage ui_page() const { return ui_page_; }
 
@@ -219,6 +228,7 @@ class ArcAuthService : public ArcService,
   UIPage ui_page_ = UIPage::NO_PAGE;
   base::string16 ui_page_status_;
   bool clear_required_ = false;
+  bool reenable_arc_ = false;
   bool waiting_for_reply_ = false;
 
   std::unique_ptr<ArcAuthContext> context_;