Shill: ShillServiceClient destroys ShillClientHelpers when they are not need.

chromeos/dbus/shill_client_helper.h

Index: chromeos/dbus/shill_client_helper.h
diff --git a/chromeos/dbus/shill_client_helper.h b/chromeos/dbus/shill_client_helper.h
index b8f769c4fcf76dc0aaeb848b6584b78c7c875d72..1b27fffe70236d8c2894887cf13e656619871f02 100644
--- a/chromeos/dbus/shill_client_helper.h
+++ b/chromeos/dbus/shill_client_helper.h
@@ -66,6 +66,14 @@ class ShillClientHelper {
 
   virtual ~ShillClientHelper();
 
+  // Returns true if there is a PropertyChangedObserver registered.
+  bool IsObserved() const;
+
+  // Returns true if the are method calls waiting for a response. If this
+  // function is called from within the return callback return true only if
+  // there are *other* calls waiting for a response.
+  bool IsWaitingResponse() const;
+
   // Adds an |observer| of the PropertyChanged signal.
   void AddPropertyChangedObserver(ShillPropertyChangedObserver* observer);
 
@@ -180,6 +188,7 @@ class ShillClientHelper {
   PropertyChangedHandler property_changed_handler_;
   ObserverList<ShillPropertyChangedObserver, true /* check_empty */>
       observer_list_;
+  int in_progress_calls_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.