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

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm

 // 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 "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.h"
 
 #include <utility>
 
 #import "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.h"
 
 DesktopMediaPickerCocoa::DesktopMediaPickerCocoa() {
 }
 
 DesktopMediaPickerCocoa::~DesktopMediaPickerCocoa() {
 }
 
 void DesktopMediaPickerCocoa::Show(content::WebContents* web_contents,
                                    gfx::NativeWindow context,
                                    gfx::NativeWindow parent,
                                    const base::string16& app_name,
                                    const base::string16& target_name,
-                                   scoped_ptr<DesktopMediaList> media_list,
+                                   std::unique_ptr<DesktopMediaList> media_list,
                                    bool request_audio,
                                    const DoneCallback& done_callback) {
   controller_.reset([[DesktopMediaPickerController alloc]
       initWithMediaList:std::move(media_list)
                  parent:parent
                callback:done_callback
                 appName:app_name
              targetName:target_name
            requestAudio:request_audio]);
   [controller_ showWindow:nil];
 }
 
 // static
-scoped_ptr<DesktopMediaPicker> DesktopMediaPicker::Create() {
-  return scoped_ptr<DesktopMediaPicker>(new DesktopMediaPickerCocoa());
+std::unique_ptr<DesktopMediaPicker> DesktopMediaPicker::Create() {
+  return std::unique_ptr<DesktopMediaPicker>(new DesktopMediaPickerCocoa());
 }