events: Get rid of GestureStatus in favour of EventResult.

ash/wm/window_modality_controller.cc

Index: ash/wm/window_modality_controller.cc
diff --git a/ash/wm/window_modality_controller.cc b/ash/wm/window_modality_controller.cc
index 65325657dfc0e07ac0cb04ffa436d9153adda41c..902612bed02143bb8ee45a89aac86b6efc012ffb 100644
--- a/ash/wm/window_modality_controller.cc
+++ b/ash/wm/window_modality_controller.cc
@@ -91,11 +91,11 @@ ui::TouchStatus WindowModalityController::PreHandleTouchEvent(
                                               ui::TOUCH_STATUS_UNKNOWN;
 }
 
-ui::GestureStatus WindowModalityController::PreHandleGestureEvent(
+ui::EventResult WindowModalityController::PreHandleGestureEvent(
     aura::Window* target,
     ui::GestureEvent* event) {
   // TODO: make gestures work with modals.
-  return ui::GESTURE_STATUS_UNKNOWN;
+  return ui::ER_UNHANDLED;
 }
 
 void WindowModalityController::OnWindowInitialized(aura::Window* window) {