Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/aura/native_window_tracker_aura.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 "chrome/browser/ui/aura/native_window_tracker_aura.h"
 
 #include "ui/aura/window.h"
 
 NativeWindowTrackerAura::NativeWindowTrackerAura(
     gfx::NativeWindow window)
@@ skipping 10 matching lines @@
   return window_ == nullptr;
 }
 
 void NativeWindowTrackerAura::OnWindowDestroying(
     aura::Window* window) {
   window_->RemoveObserver(this);
   window_ = nullptr;
 }
 
 // static
-scoped_ptr<NativeWindowTracker> NativeWindowTracker::Create(
+std::unique_ptr<NativeWindowTracker> NativeWindowTracker::Create(
     gfx::NativeWindow window) {
-  return scoped_ptr<NativeWindowTracker>(new NativeWindowTrackerAura(window));
+  return std::unique_ptr<NativeWindowTracker>(
+      new NativeWindowTrackerAura(window));
 }