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

chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa_browsertest.mm

 // 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 "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa.h"
 
 #include "chrome/browser/media_galleries/media_galleries_dialog_controller_mock.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_alert.h"
@@ skipping 24 matching lines @@
   std::vector<base::string16> headers;
   headers.push_back(base::string16());  // The first section has no header.
   headers.push_back(base::ASCIIToUTF16("header2"));
   ON_CALL(controller, GetSectionHeaders()).
       WillByDefault(Return(headers));
   EXPECT_CALL(controller, GetAuxiliaryButtonText()).
       WillRepeatedly(Return(base::ASCIIToUTF16("button")));
   EXPECT_CALL(controller, GetSectionEntries(_)).
       Times(AnyNumber());
 
-  scoped_ptr<MediaGalleriesDialogCocoa> dialog(
+  std::unique_ptr<MediaGalleriesDialogCocoa> dialog(
       static_cast<MediaGalleriesDialogCocoa*>(
           MediaGalleriesDialog::Create(&controller)));
   base::scoped_nsobject<NSWindow> window([[dialog->alert_ window] retain]);
   EXPECT_TRUE([window isVisible]);
 
   web_modal::WebContentsModalDialogManager* manager =
       web_modal::WebContentsModalDialogManager::FromWebContents(web_contents);
   web_modal::WebContentsModalDialogManager::TestApi(manager).CloseAllDialogs();
   EXPECT_FALSE([window isVisible]);
 }