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

chrome/browser/extensions/bookmark_app_helper.h

Index: chrome/browser/extensions/bookmark_app_helper.h
diff --git a/chrome/browser/extensions/bookmark_app_helper.h b/chrome/browser/extensions/bookmark_app_helper.h
index 431ca523b6ec0fce3409b3df89c289972dd2a163..ff260aebaf2e0c93f042d1aef7b59fd0bdf0b181 100644
--- a/chrome/browser/extensions/bookmark_app_helper.h
+++ b/chrome/browser/extensions/bookmark_app_helper.h
@@ -6,12 +6,12 @@
 #define CHROME_BROWSER_EXTENSIONS_BOOKMARK_APP_HELPER_H_
 
 #include <map>
+#include <memory>
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/common/web_application_info.h"
 #include "content/public/browser/notification_observer.h"
@@ -149,7 +149,7 @@ class BookmarkAppHelper : public content::NotificationObserver {
 
   // Downloads icons from the given WebApplicationInfo using the given
   // WebContents.
-  scoped_ptr<FaviconDownloader> favicon_downloader_;
+  std::unique_ptr<FaviconDownloader> favicon_downloader_;
 
   // Used to install the created bookmark app.
   scoped_refptr<extensions::CrxInstaller> crx_installer_;