Clean up a bunch of our Dart code.

sky/sdk/lib/framework/components2/button.dart

Index: sky/sdk/lib/framework/components2/button.dart
diff --git a/sky/sdk/lib/framework/components2/button.dart b/sky/sdk/lib/framework/components2/button.dart
index 3b2fd5f1311e5f6338f7fdbef01992f4e8c29a57..6a743b2c3cda943a44b1b865ee7d160419fd27b0 100644
--- a/sky/sdk/lib/framework/components2/button.dart
+++ b/sky/sdk/lib/framework/components2/button.dart
@@ -7,6 +7,9 @@ import 'ink_well.dart';
 import 'material.dart';
 
 class Button extends Component {
+
+  Button({ Object key, this.content, this.level }) : super(key: key);
+
   static final Style _style = new Style('''
     -webkit-user-select: none;
     height: 36px;
@@ -19,8 +22,6 @@ class Button extends Component {
   UINode content;
   int level;
 
-  Button({ Object key, this.content, this.level }) : super(key: key);
-
   UINode build() {
     return new StyleNode(
       new Material(
@@ -28,4 +29,5 @@ class Button extends Component {
         level: level),
       _style);
   }
+
 }