Separate JumpListIcons delete task and update task

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 d8d96025425cbefe427f7cba65442d8284f97f07..070041bdb18d3dd313c437f9419ab5883fff4387 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -32,6 +32,7 @@
 
 namespace base {
 class SingleThreadTaskRunner;
+class SequencedTaskRunner;
 }
 
 namespace chrome {
@@ -189,6 +190,9 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   // delete JumpListIconsOld sequentially.

[gab, 2017/04/10 19:33:12]

Update comment.

[chengx, 2017/04/10 21:09:14]

Done.

   scoped_refptr<base::SingleThreadTaskRunner> single_thread_task_runner_;

[gab, 2017/04/10 19:33:12]

Make these variable names specific now that they're single purpose.

[chengx, 2017/04/10 21:09:14]

Done.

 
+  // A task runner which runs the background JumpListIconsOld deletion tasks.
+  scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_;
+
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;