Switch SupportsUserData uses to use unique_ptr.

components/favicon/ios/web_favicon_driver.h

 // Copyright 2015 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 COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
 #define COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
 
 #include "base/macros.h"
 #include "components/favicon/core/favicon_driver_impl.h"
 #import "components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #include "ios/web/public/web_state/web_state_user_data.h"
 
 namespace web {
 class WebState;
 }
 
 namespace favicon {
 
 // WebFaviconDriver is an implementation of FaviconDriver that listen to
 // WebState events to start download of favicons and to get informed when the
 // favicon download has completed.
 class WebFaviconDriver : public web::WebStateObserver,
                          public web::WebStateUserData<WebFaviconDriver>,
                          public FaviconDriverImpl {
  public:
+  ~WebFaviconDriver() override;
+
   static void CreateForWebState(web::WebState* web_state,
                                 FaviconService* favicon_service,
                                 history::HistoryService* history_service,
                                 bookmarks::BookmarkModel* bookmark_model);
 
   // FaviconDriver implementation.
   void FetchFavicon(const GURL& url) override;
   gfx::Image GetFavicon() const override;
   bool FaviconIsValid() const override;
   GURL GetActiveURL() override;
@@ skipping 10 matching lines @@
       bool icon_url_changed,
       const gfx::Image& image) override;
 
  private:
   friend class web::WebStateUserData<WebFaviconDriver>;
 
   WebFaviconDriver(web::WebState* web_state,
                    FaviconService* favicon_service,
                    history::HistoryService* history_service,
                    bookmarks::BookmarkModel* bookmark_model);
-  ~WebFaviconDriver() override;
 
   // web::WebStateObserver implementation.
   void FaviconUrlUpdated(
       const std::vector<web::FaviconURL>& candidates) override;
 
   // The URL passed to FetchFavicon().
   GURL fetch_favicon_url_;
 
   // Image Fetcher used to fetch favicon.
   image_fetcher::IOSImageDataFetcherWrapper image_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFaviconDriver);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_