Change ui::Event::time_stamp from TimeDelta to TimeTicks

ui/base/user_activity/user_activity_detector_unittest.cc

Index: ui/base/user_activity/user_activity_detector_unittest.cc
diff --git a/ui/base/user_activity/user_activity_detector_unittest.cc b/ui/base/user_activity/user_activity_detector_unittest.cc
index c8949ab10e943c492f65df3e13e16e4a52b4e50c..5bcc7a9000ad794f5da09feb52afc53b4282aa60 100644
--- a/ui/base/user_activity/user_activity_detector_unittest.cc
+++ b/ui/base/user_activity/user_activity_detector_unittest.cc
@@ -141,8 +141,8 @@ TEST_F(UserActivityDetectorTest, Basic) {
   observer_->reset_stats();
 
   AdvanceTime(advance_delta);
-  ui::TouchEvent touch_event(
-      ui::ET_TOUCH_PRESSED, gfx::Point(), 0, base::TimeDelta());
+  ui::TouchEvent touch_event(ui::ET_TOUCH_PRESSED, gfx::Point(), 0,
+                             base::TimeTicks());
   OnEvent(&touch_event);
   EXPECT_FALSE(touch_event.handled());
   EXPECT_EQ(now_.ToInternalValue(),
@@ -151,12 +151,8 @@ TEST_F(UserActivityDetectorTest, Basic) {
   observer_->reset_stats();
 
   AdvanceTime(advance_delta);
-  ui::GestureEvent gesture_event(
-      0,
-      0,
-      ui::EF_NONE,
-      base::TimeDelta::FromMilliseconds(base::Time::Now().ToDoubleT() * 1000),
-      ui::GestureEventDetails(ui::ET_GESTURE_TAP));
+  ui::GestureEvent gesture_event(0, 0, ui::EF_NONE, base::TimeTicks::Now(),
+                                 ui::GestureEventDetails(ui::ET_GESTURE_TAP));
   OnEvent(&gesture_event);
   EXPECT_FALSE(gesture_event.handled());
   EXPECT_EQ(now_.ToInternalValue(),