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

ash/launcher/launcher_tooltip_manager_unittest.cc

Index: ash/launcher/launcher_tooltip_manager_unittest.cc
diff --git a/ash/launcher/launcher_tooltip_manager_unittest.cc b/ash/launcher/launcher_tooltip_manager_unittest.cc
index 94b4c285495b0812bb0ccb3021969e2c2f416d0d..39ba6dcc8d59ada3f047fdf59988609beb35ac51 100644
--- a/ash/launcher/launcher_tooltip_manager_unittest.cc
+++ b/ash/launcher/launcher_tooltip_manager_unittest.cc
@@ -184,8 +184,8 @@ TEST_F(LauncherTooltipManagerTest, ShouldHideForEvents) {
       base::TimeDelta::FromMilliseconds(base::Time::Now().ToDoubleT() * 1000),
       ui::GestureEventDetails(ui::ET_GESTURE_BEGIN, 0.0f, 0.0f), 0);
   SetEventTarget(tooltip_widget->GetNativeWindow(), &gesture_event);
-  EXPECT_EQ(ui::ER_UNHANDLED,
-            event_handler->OnGestureEvent(&gesture_event));
+  event_handler->OnGestureEvent(&gesture_event);
+  EXPECT_FALSE(gesture_event.handled());
   RunAllPendingInMessageLoop();
   EXPECT_FALSE(TooltipIsVisible());
 }