Fix crash on key events in touchview.

ash/wm/maximize_mode/internal_input_device_list_x11.cc

Index: ash/wm/maximize_mode/internal_input_device_list_x11.cc
diff --git a/ash/wm/maximize_mode/internal_input_device_list_x11.cc b/ash/wm/maximize_mode/internal_input_device_list_x11.cc
index 9a490ec6197f9f3c30f4e87003e7eb177e7de531..8753f8259de932def03c1db588ebc14bce7ec559 100644
--- a/ash/wm/maximize_mode/internal_input_device_list_x11.cc
+++ b/ash/wm/maximize_mode/internal_input_device_list_x11.cc
@@ -44,8 +44,11 @@ InternalInputDeviceListX11::~InternalInputDeviceListX11() {
 
 bool InternalInputDeviceListX11::IsEventFromInternalDevice(
     const ui::Event* event) {
-  if (!event->HasNativeEvent())
+  if (!event->HasNativeEvent() ||
+      event->native_event()->type != GenericEvent) {
     return false;
+  }
+
   XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(
       event->native_event()->xcookie.data);
   return internal_device_ids_.find(xiev->sourceid) !=