Fixes issue with accelerators when a menu is open

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index a1dcb76047e469a2736b781fe25a582a7f1f2919..dac33a6d7938dbda2c00a6fca86f9679b801702d 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -36,6 +36,7 @@ namespace ash {
 
 class AcceleratorController;
 class Launcher;
+class NestedDispatcherController;
 class PowerButtonController;
 class ShellDelegate;
 class VideoDetector;
@@ -169,6 +170,8 @@ class ASH_EXPORT Shell {
 
   base::WeakPtrFactory<Shell> method_factory_;
 
+  scoped_ptr<NestedDispatcherController> nested_dispatcher_controller_;
+
   scoped_ptr<AcceleratorController> accelerator_controller_;
 
   scoped_ptr<ShellDelegate> delegate_;