Clean up stock_app.dart

sky/framework/components/icon_button.dart

+// 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.
+
+import '../fn.dart';
+import 'icon.dart';
+
+class IconButton extends Component {
+  static Style _style = new Style('''
+    padding: 8px;''');
+
+  String icon;
+  GestureEventListener onGestureTap;
+
+  IconButton({ String icon: '', this.onGestureTap })
+    : super(key: icon), icon = icon;
+
+  Node build() {
+    return new EventTarget(
+      new StyleNode(new Icon(type: icon, size: 24), _style),
+      onGestureTap: onGestureTap);
+  }
+}