Replace scoped_ptr with std::unique_ptr in //ui

ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc

 // Copyright 2014 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/display/chromeos/x11/native_display_event_dispatcher_x11.h"
 
 #include <X11/extensions/Xrandr.h>
 #include <utility>
 
 #include "base/time/default_tick_clock.h"
@@ skipping 91 matching lines @@
       return ui::POST_DISPATCH_PERFORM_DEFAULT;
     }
   }
 
   delegate_->NotifyDisplayObservers();
 
   return ui::POST_DISPATCH_PERFORM_DEFAULT;
 }
 
 void NativeDisplayEventDispatcherX11::SetTickClockForTest(
-    scoped_ptr<base::TickClock> tick_clock) {
+    std::unique_ptr<base::TickClock> tick_clock) {
   tick_clock_ = std::move(tick_clock);
   startup_time_ = tick_clock_->NowTicks();
 }
 
 }  // namespace ui