Introduce ArcServiceManager::OnShutdown().

components/arc/arc_service_manager.h

Index: components/arc/arc_service_manager.h
diff --git a/components/arc/arc_service_manager.h b/components/arc/arc_service_manager.h
index cc3dbf6e083726af990d8756bf09ae7d5c938e98..091fc9d96a8a3d3669f1dce5c5ed19d0dd000946 100644
--- a/components/arc/arc_service_manager.h
+++ b/components/arc/arc_service_manager.h
@@ -28,6 +28,11 @@ class ArcServiceManager {
  public:
   class Observer {
    public:
+    // Called when ArcServiceManager is being shutdown. Observer implementation

[Daniel Erat, 2016/12/16 16:05:44]

nit: s/shutdown/shut down/ ("shut down" is the verb, "shutdown" is the noun)

[hidehiko, 2016/12/16 17:14:17]

Good to know about verb v.s. noun. Thank you. Fixed.

+    // should call clean up ARC related stuff here. One of the typical

[Daniel Erat, 2016/12/16 16:05:44]

nit: delete "call"?

[hidehiko, 2016/12/16 17:14:17]

Done.

+    // use case is calling ArcServiceManager::RemoveObserver().

[Daniel Erat, 2016/12/16 16:05:44]

nit: s/case/cases/

[hidehiko, 2016/12/16 17:14:17]

Done.

+    virtual void OnArcShutdown() = 0;
+
     // Called when intent filters are added or removed.
     virtual void OnIntentFiltersUpdated() = 0;