Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/lock_state_controller.cc

 // Copyright 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 "ash/wm/lock_state_controller.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 85 matching lines @@
   Shell::GetPrimaryRootWindow()->GetHost()->AddObserver(this);
 }
 
 LockStateController::~LockStateController() {
   // TODO(jdufault): Remove after resolving crbug.com/452599.
   VLOG(0) << "Destroying LockStateController instance " << this;
   Shell::GetPrimaryRootWindow()->GetHost()->RemoveObserver(this);
 }
 
 void LockStateController::SetDelegate(
-    scoped_ptr<LockStateControllerDelegate> delegate) {
+    std::unique_ptr<LockStateControllerDelegate> delegate) {
   delegate_ = std::move(delegate);
 }
 
 void LockStateController::AddObserver(LockStateObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void LockStateController::RemoveObserver(LockStateObserver* observer) {
   observers_.RemoveObserver(observer);
 }
@@ skipping 519 matching lines @@
   if (unlocked_properties_.get() &&
       unlocked_properties_->background_is_hidden) {
     animation_sequence->StartAnimation(
         SessionStateAnimator::DESKTOP_BACKGROUND,
         SessionStateAnimator::ANIMATION_FADE_OUT,
         speed);
   }
 }
 
 }  // namespace ash