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

chrome/browser/ui/webui/omnibox/omnibox_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OMNIBOX_OMNIBOX_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_OMNIBOX_OMNIBOX_UI_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/webui/mojo_web_ui_controller.h"
 #include "chrome/browser/ui/webui/omnibox/omnibox.mojom.h"
 
 class OmniboxUIHandler;
 
 // The UI for chrome://omnibox/
 class OmniboxUI : public MojoWebUIController<mojom::OmniboxUIHandlerMojo> {
  public:
   explicit OmniboxUI(content::WebUI* contents);
   ~OmniboxUI() override;
 
  private:
   // MojoWebUIController overrides:
   void BindUIHandler(
       mojo::InterfaceRequest<mojom::OmniboxUIHandlerMojo> request) override;
 
-  scoped_ptr<OmniboxUIHandler> omnibox_ui_handler_;
+  std::unique_ptr<OmniboxUIHandler> omnibox_ui_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OMNIBOX_OMNIBOX_UI_H_