Remove JumpListIconsOld directory and set upper limit for delete attempts

chrome/browser/win/jumplist.h

Index: chrome/browser/win/jumplist.h
diff --git a/chrome/browser/win/jumplist.h b/chrome/browser/win/jumplist.h
index bb5befa04024914c82a71f71a93fc7a966aa7aa0..032165f9deea80f496f08595d4f12d700a5fe1b3 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -17,6 +17,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/task/cancelable_task_tracker.h"
+#include "base/task_scheduler/post_task.h"

[grt (UTC plus 2), 2017/03/23 11:24:57]

move to .cc file

[chengx, 2017/03/23 21:16:11]

Done.

 #include "base/timer/timer.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/win/jumplist_updater.h"
@@ -181,6 +182,9 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   // comes in before it finishes.
   base::CancelableTaskTracker::TaskId task_id_;
 
+  // A task runner which runs the background file deletion tasks sequentially.
+  scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_;
+
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;