Fixing cleanup of dart:html annotation generation.

tools/dom/templates/html/impl/impl_Storage.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
-$ANNOTATIONS
-class $CLASSNAME$EXTENDS implements Map<String, String> $NATIVESPEC {
+
+$(ANNOTATIONS)class $CLASSNAME$EXTENDS implements Map<String, String>
+    $NATIVESPEC {
 
   // TODO(nweiz): update this when maps support lazy iteration
   bool containsValue(String value) => values.any((e) => e == value);
 
   bool containsKey(String key) => $dom_getItem(key) != null;
 
   String operator [](String key) => $dom_getItem(key);
 
   void operator []=(String key, String value) { $dom_setItem(key, value); }
 
@@ skipping 29 matching lines @@
     final values = [];
     forEach((k, v) => values.add(v));
     return values;
   }
 
   int get length => $dom_length;
 
   bool get isEmpty => $dom_key(0) == null;
 $!MEMBERS
 }