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

chrome/browser/ui/native_window_tracker.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_NATIVE_WINDOW_TRACKER_H_
 #define CHROME_BROWSER_UI_NATIVE_WINDOW_TRACKER_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "ui/gfx/native_widget_types.h"
 
 // An observer which detects when a gfx::NativeWindow is closed.
 class NativeWindowTracker {
  public:
   virtual ~NativeWindowTracker() {}
 
-  static scoped_ptr<NativeWindowTracker> Create(gfx::NativeWindow window);
+  static std::unique_ptr<NativeWindowTracker> Create(gfx::NativeWindow window);
 
   // Returns true if the native window passed to Create() has been closed.
   virtual bool WasNativeWindowClosed() const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_NATIVE_WINDOW_TRACKER_H_