web: dartfmt all files

web/gallery/lib/demo/material/scrollable_tabs_demo.dart

@@ -143,8 +143,7 @@ class ScrollableTabsDemoState extends State<ScrollableTabsDemo>
                   value: TabsDemoStyle.iconsAndText,
                   child: Text('Icons and text')),
               const PopupMenuItem<TabsDemoStyle>(
-                      value: TabsDemoStyle.iconsOnly,
+                  value: TabsDemoStyle.iconsOnly, child: Text('Icons only')),
-                      child: Text('Icons only')),
               const PopupMenuItem<TabsDemoStyle>(
                   value: TabsDemoStyle.textOnly, child: Text('Text only')),
             ],