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

ui/aura/test/test_window_delegate.cc

Index: ui/aura/test/test_window_delegate.cc
diff --git a/ui/aura/test/test_window_delegate.cc b/ui/aura/test/test_window_delegate.cc
index 7e5835cda067209e0d89abee4ae76e845618da96..51f2dfbc0b262564626f48451b308064356d6d0c 100644
--- a/ui/aura/test/test_window_delegate.cc
+++ b/ui/aura/test/test_window_delegate.cc
@@ -101,23 +101,6 @@ scoped_refptr<ui::Texture> TestWindowDelegate::CopyTexture() {
   return scoped_refptr<ui::Texture>();
 }
 
-ui::EventResult TestWindowDelegate::OnKeyEvent(ui::KeyEvent* event) {
-  return ui::ER_UNHANDLED;
-}
-
-ui::EventResult TestWindowDelegate::OnMouseEvent(ui::MouseEvent* event) {
-  return ui::ER_UNHANDLED;
-}
-
-ui::EventResult TestWindowDelegate::OnTouchEvent(ui::TouchEvent* event) {
-  return ui::ER_UNHANDLED;
-}
-
-ui::EventResult TestWindowDelegate::OnGestureEvent(
-    ui::GestureEvent* event) {
-  return ui::ER_UNHANDLED;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // ColorTestWindowDelegate