Remove linked_ptr from ash

ash/wm/video_detector.cc

 // Copyright (c) 2012 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 "ash/wm/video_detector.h"
 
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ skipping 101 matching lines @@
 
 void VideoDetector::OnWindowInitialized(aura::Window* window) {
   window_observer_manager_.Add(window);
 }
 
 void VideoDetector::OnDelegatedFrameDamage(
     aura::Window* window,
     const gfx::Rect& damage_rect_in_dip) {
   if (is_shutting_down_)
     return;
-  linked_ptr<WindowInfo>& info = window_infos_[window];
+  std::unique_ptr<WindowInfo>& info = window_infos_[window];
   if (!info.get())
     info.reset(new WindowInfo);
 
   base::TimeTicks now =
       !now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now();
   if (info->RecordUpdateAndCheckForVideo(damage_rect_in_dip, now))
     HandleVideoActivity(window, now);
 }
 
 void VideoDetector::OnWindowDestroyed(aura::Window* window) {
@@ skipping 57 matching lines @@
   }
 
   if (state_ != new_state) {
     state_ = new_state;
     for (auto& observer : observers_)
       observer.OnVideoStateChanged(state_);
   }
 }
 
 }  // namespace ash