Remove MessageLoop::current() from history_service.cc

components/history/core/browser/history_backend.h

Index: components/history/core/browser/history_backend.h
diff --git a/components/history/core/browser/history_backend.h b/components/history/core/browser/history_backend.h
index 0d044f7b33467c24075eaaa0f6d246407a63d3fe..130d9b7b614085893230f11d58d2106102820da7 100644
--- a/components/history/core/browser/history_backend.h
+++ b/components/history/core/browser/history_backend.h
@@ -41,7 +41,6 @@ class TestingProfile;
 struct ThumbnailScore;
 
 namespace base {
-class MessageLoop;
 class SingleThreadTaskRunner;
 }
 
@@ -457,8 +456,9 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   // Sets the task to run and the message loop to run it on when this object
   // is destroyed. See HistoryService::SetOnBackendDestroyTask for a more
   // complete description.
-  void SetOnBackendDestroyTask(base::MessageLoop* message_loop,
-                               const base::Closure& task);
+  void SetOnBackendDestroyTask(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      const base::Closure& task);
 
   // Adds the given rows to the database if it doesn't exist. A visit will be
   // added for each given URL at the last visit time in the URLRow if the
@@ -852,7 +852,7 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   base::Time first_recorded_time_;
 
   // When set, this is the task that should be invoked on destruction.
-  base::MessageLoop* backend_destroy_message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> backend_destroy_task_runner_;
   base::Closure backend_destroy_task_;
 
   // Tracks page transition types.