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

chrome/browser/extensions/bookmark_app_helper.cc

Index: chrome/browser/extensions/bookmark_app_helper.cc
diff --git a/chrome/browser/extensions/bookmark_app_helper.cc b/chrome/browser/extensions/bookmark_app_helper.cc
index ddb1d78843fb9b788b881bcf75a66b3e56fc5be5..737603531cc544d5c74ee1eb92472ef05b80aaea 100644
--- a/chrome/browser/extensions/bookmark_app_helper.cc
+++ b/chrome/browser/extensions/bookmark_app_helper.cc
@@ -325,8 +325,8 @@ class BookmarkAppInstaller : public base::RefCounted<BookmarkAppInstaller>,
   ExtensionService* service_;
   WebApplicationInfo web_app_info_;
 
-  scoped_ptr<content::WebContents> web_contents_;
-  scoped_ptr<FaviconDownloader> favicon_downloader_;
+  std::unique_ptr<content::WebContents> web_contents_;
+  std::unique_ptr<FaviconDownloader> favicon_downloader_;
   std::vector<GURL> urls_to_download_;
   std::vector<BookmarkAppHelper::BitmapAndSource> downloaded_bitmaps_;
 };