events: Update scroll and touch handlers to not return EventResult.

ash/touch/touch_observer_hud.cc

Index: ash/touch/touch_observer_hud.cc
diff --git a/ash/touch/touch_observer_hud.cc b/ash/touch/touch_observer_hud.cc
index 22dc0292c4815f7ba51967c05b3fcd1e615b04ed..176e52f95d1d506f7844061e8bfdf56b9e4414e7 100644
--- a/ash/touch/touch_observer_hud.cc
+++ b/ash/touch/touch_observer_hud.cc
@@ -182,9 +182,9 @@ void TouchObserverHUD::UpdateTouchPointLabel(int index) {
   touch_labels_[index]->SetText(UTF8ToUTF16(string));
 }
 
-ui::EventResult TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
+void TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
   if (event->touch_id() >= kMaxTouchPoints)
-    return ui::ER_UNHANDLED;
+    return;
 
   if (event->type() != ui::ET_TOUCH_CANCELLED)
     touch_positions_[event->touch_id()] = event->root_location();
@@ -197,8 +197,6 @@ ui::EventResult TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
   UpdateTouchPointLabel(event->touch_id());
 
   widget_->SetSize(widget_->GetContentsView()->GetPreferredSize());
-
-  return ui::ER_UNHANDLED;
 }
 
 void TouchObserverHUD::OnWidgetClosing(views::Widget* widget) {