CSSStyleDeclaration#cssText should take a string.

client/html/src/CSSStyleDeclarationWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 // WARNING: Do not edit.
 // This file was generated by html/scripts/css_code_generator.py
 
 // Source of CSS properties:
 //   Source/WebCore/css/CSSPropertyNames.in
 
@@ skipping 21 matching lines @@
       } else {
         _cachedBrowserPrefix = '-webkit-';
       }
       // TODO(jacobr): support IE 9.0 and Opera as well.
     }
     return _cachedBrowserPrefix;
   }
 
   String get cssText() { return _ptr.cssText; }
 
-  void set cssText(var value) { _ptr.cssText = value; }
+  void set cssText(String value) { _ptr.cssText = value; }
 
   int get length() { return _ptr.length; }
 
   CSSRule get parentRule() { return LevelDom.wrapCSSRule(_ptr.parentRule); }
 
   CSSValue getPropertyCSSValue(String propertyName) {
     return LevelDom.wrapCSSValue(_ptr.getPropertyCSSValue(propertyName));
   }
 
   String getPropertyPriority(String propertyName) {
@@ skipping 2783 matching lines @@
 
   /** Gets the value of "zoom" */
   String get zoom() =>
     getPropertyValue('zoom');
 
   /** Sets the value of "zoom" */
   void set zoom(var value) {
     setProperty('zoom', value, '');
   }
 }