events: Change gesture-event handler in EventHandler to not return any values.

ash/wm/system_gesture_event_filter.cc

Index: ash/wm/system_gesture_event_filter.cc
diff --git a/ash/wm/system_gesture_event_filter.cc b/ash/wm/system_gesture_event_filter.cc
index 5e40f93de5dc303c04ec386dd37b6ccc45ff5670..57aecd42458c0f618c2a8315442b4b900eba0c2a 100644
--- a/ash/wm/system_gesture_event_filter.cc
+++ b/ash/wm/system_gesture_event_filter.cc
@@ -72,8 +72,7 @@ ui::EventResult SystemGestureEventFilter::OnTouchEvent(ui::TouchEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
-ui::EventResult SystemGestureEventFilter::OnGestureEvent(
-    ui::GestureEvent* event) {
+void SystemGestureEventFilter::OnGestureEvent(ui::GestureEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   touch_uma_.RecordGestureEvent(target, *event);
   long_press_affordance_->ProcessEvent(target, event,
@@ -81,18 +80,21 @@ ui::EventResult SystemGestureEventFilter::OnGestureEvent(
 
   if (!target || target == target->GetRootWindow()) {
     bezel_gestures_->ProcessGestureEvent(target, *event);
-    return ui::ER_CONSUMED;
+    event->StopPropagation();
+    return;
   }
 
-  if (two_finger_drag_->ProcessGestureEvent(target, *event))
-    return ui::ER_CONSUMED;
+  if (two_finger_drag_->ProcessGestureEvent(target, *event)) {
+    event->StopPropagation();
+    return;
+  }
 
   if (!system_gestures_enabled_)
-    return ui::ER_UNHANDLED;
+    return;
 
   aura::Window* system_target = GetTargetForSystemGestureEvent(target);
   if (!system_target)
-    return ui::ER_UNHANDLED;
+    return;
 
   RootWindowController* root_controller =
       GetRootWindowController(system_target->GetRootWindow());
@@ -108,9 +110,9 @@ ui::EventResult SystemGestureEventFilter::OnGestureEvent(
       ash::AcceleratorController* accelerator =
           ash::Shell::GetInstance()->accelerator_controller();
       if (accelerator->PerformAction(CYCLE_FORWARD_MRU, ui::Accelerator()))
-        return ui::ER_CONSUMED;
+        event->StopPropagation();
     }
-    return ui::ER_UNHANDLED;
+    return;
   }
 
   WindowPinchHandlerMap::iterator find = pinch_handlers_.find(system_target);
@@ -119,18 +121,16 @@ ui::EventResult SystemGestureEventFilter::OnGestureEvent(
         (*find).second->ProcessGestureEvent(*event);
     if (status == SYSTEM_GESTURE_END)
       ClearGestureHandlerForWindow(system_target);
-    return ui::ER_CONSUMED;
+    event->StopPropagation();
   } else {
     if (event->type() == ui::ET_GESTURE_BEGIN &&
         event->details().touch_points() >=
         SystemPinchHandler::kSystemGesturePoints) {
       pinch_handlers_[system_target] = new SystemPinchHandler(system_target);
       system_target->AddObserver(this);
-      return ui::ER_CONSUMED;
+      event->StopPropagation();
     }
   }
-
-  return ui::ER_UNHANDLED;
 }
 
 void SystemGestureEventFilter::OnWindowVisibilityChanged(aura::Window* window,