chromeos: makes mus send keyevents to display root when nothing has focus

ash/mus/accelerators/accelerator_controller_registrar.h

Index: ash/mus/accelerators/accelerator_controller_registrar.h
diff --git a/ash/mus/accelerators/accelerator_controller_registrar.h b/ash/mus/accelerators/accelerator_controller_registrar.h
index a311885375ca0ddc5035a35714e56b3a4ac8b196..29fa1bf1aab595f79139fb37263794aed6bd254a 100644
--- a/ash/mus/accelerators/accelerator_controller_registrar.h
+++ b/ash/mus/accelerators/accelerator_controller_registrar.h
@@ -72,7 +72,7 @@ class AcceleratorControllerRegistrar : public AcceleratorHandler,
   // . AcceleratorFilter forwards to its delegate, which indirectly is
   //   implemented by AcceleratorRouter.
   // . AcceleratorRouter may early out, if not it calls through to
-  //   AcceleratorController. This stop may stop propagation entirely.
+  //   AcceleratorController. This may stop propagation entirely.
   // . If focus is on a Widget, then NativeWidgetAura gets the key event, calls
   //   to Widget::OnKeyEvent(), which calls to FocusManager::OnKeyEvent(), which
   //   calls to AshFocusManagerFactory::Delegate::ProcessAccelerator() finally