Refactor fn2.dart, since it breached our 1000-line threshold.

sky/sdk/lib/framework/editing2/input.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 '../editing2/editable_string.dart';
-import '../editing2/editable_text.dart';
-import '../editing2/keyboard.dart';
-import '../fn2.dart';
-import '../theme2/colors.dart';
-import '../theme2/typography.dart' as typography;
+import 'dart:sky' as sky;
+
 import '../rendering/flex.dart';
-import 'dart:sky' as sky;
+import '../widgets/wrappers.dart';
+import 'editable_string.dart';
+import 'editable_text.dart';
+import 'keyboard.dart';
 
 typedef void ValueChanged(value);
 
 class Input extends Component {
 
   Input({Object key,
          this.placeholder,
          this.onChanged,
          this.focused})
       : super(key: key, stateful: true) {
@@ skipping 73 matching lines @@
     );
   }
 
   void didUnmount() {
     if (_isAttachedToKeyboard)
       keyboard.hide();
     super.didUnmount();
   }
 
 }