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..5c1c932cd041fcbdf238e3bd6010b94d5bcee430 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -30,6 +30,10 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace chrome {
 struct FaviconImageResult;
 }
@@ -181,6 +185,9 @@ 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_;