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

ui/views/mus/native_widget_mus_unittest.cc

Index: ui/views/mus/native_widget_mus_unittest.cc
diff --git a/ui/views/mus/native_widget_mus_unittest.cc b/ui/views/mus/native_widget_mus_unittest.cc
index 53f9338ed07a43a59f9bef8da44da03cd0c4e074..e322e87673d2608e77b9e3d47e932b7d601e11f6 100644
--- a/ui/views/mus/native_widget_mus_unittest.cc
+++ b/ui/views/mus/native_widget_mus_unittest.cc
@@ -172,7 +172,7 @@ class NativeWidgetMusTest : public ViewsTestBase {
   std::unique_ptr<ui::MouseEvent> CreateMouseEvent() {
     return base::WrapUnique(new ui::MouseEvent(
         ui::ET_MOUSE_PRESSED, gfx::Point(50, 50), gfx::Point(50, 50),
-        base::TimeDelta(), ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
+        base::TimeTicks(), ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
   }
 
   // Simulates an input event to the NativeWidget.