Move the individual property definitions from client/base/Css to CSSStyleDeclaration.

client/touch/Scroller.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.
 
 /**
  * Implementation of a custom scrolling behavior.
  * This behavior overrides native scrolling for an area. This area can be a
  * single defined part of a page, the entire page, or several different parts
  * of a page.
  *
@@ skipping 193 matching lines @@
                 FAST_SNAP_DECELERATION_FACTOR);
             break;
             */
         }
         if (handled) {
           e.preventDefault();
         }
       });
     // The scrollable element must be relatively positioned.
     assert(_scrollTechnique != ScrollerScrollTechnique.RELATIVE_POSITIONING ||
-           new Css(window.getComputedStyle(
-               _element, null)).position != "static");
+           window.getComputedStyle(_element, null).position != "static");
     _initLayer();
   }
 
   EventListenerList get onScrollerStart() {
     if (_onScrollerStart === null) {
       _onScrollerStart = new SimpleEventListenerList();
     }
     return _onScrollerStart;
   }
 
@@ skipping 387 matching lines @@
 
   /**
    * Update the scroll technique used for animating the scrollable area.
    */
   void setScrollTechnique(int technique) {
     _scrollTechnique = technique;
     _setOffsetFunction = _getOffsetFunction(technique);
 
     // The scrollable element must be relatively positioned.
     assert(technique != ScrollerScrollTechnique.RELATIVE_POSITIONING ||
-        new Css(window.getComputedStyle(_element, null)).position
-          != "static");
+        window.getComputedStyle(_element, null).position != "static");
 
     if (technique != ScrollerScrollTechnique.TRANSFORM_3D) {
       FxUtil.clearWebkitTransition(_element);
       FxUtil.clearWebkitTransform(_element);
     }
     if (technique != ScrollerScrollTechnique.RELATIVE_POSITIONING) {
       FxUtil.setLeftAndTop(_element, 0, 0);
     }
     _setOffsetFunction(_element, _contentOffset.x, _contentOffset.y);
   }
@@ skipping 163 matching lines @@
     for (EventListener listener in _listeners) {
       listener(evt);
     }
   }
 }
 
 class ScrollerScrollTechnique {
   static final TRANSFORM_3D = 1;
   static final RELATIVE_POSITIONING = 2;
 }