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

ui/wm/core/capture_controller_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/wm/core/capture_controller.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 256 matching lines @@
   delegate->window()->SetCapture();
 
   // capture should not be set upon exit from SetCapture() above.
   aura::client::CaptureClient* capture_client =
       aura::client::GetCaptureClient(root_window());
   ASSERT_NE(nullptr, capture_client);
   EXPECT_EQ(nullptr, capture_client->GetCaptureWindow());
 
   // Send a mouse click. We no longer hold capture so this should not crash.
   ui::MouseEvent mouse_press(ui::ET_MOUSE_PRESSED, gfx::Point(), gfx::Point(),
-                             base::TimeDelta(), 0, 0);
+                             base::TimeTicks(), 0, 0);
   DispatchEventUsingWindowDispatcher(&mouse_press);
 }
 
 }  // namespace wm