Rename Sky's Toolbar to ActionBar

sky/framework/components/toolbar.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 '../theme/colors.dart';
-import '../theme/shadows.dart';
-import '../theme/view-configuration.dart';
-
-class Toolbar extends Component {
-  List<Node> children;
-
-  static final Style _style = new Style('''
-    display: flex;
-    align-items: center;
-    height: 56px;
-    background-color: ${Purple[500]};
-    color: white;
-    padding-top: ${kStatusBarHeight}px;
-    box-shadow: ${Shadow[2]};'''
-  );
-
-  Toolbar({String key, this.children}) : super(key: key);
-
-  Node build() {
-    return new Container(
-      style: _style,
-      children: children
-    );
-  }
-}