Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/samples/ui_lib/layout/ViewLayout.dart

-part of layout;
-
 // 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.
 
 /** The interface that the layout algorithms use to talk to the view. */
 abstract class Positionable {
   ViewLayout get layout;
 
   /** Gets our custom CSS properties, as provided by the CSS preprocessor. */
   Map<String, String> get customStyle;
@@ skipping 212 matching lines @@
       // For an unset max-content size, use the actual size
       return size;
     }
     if (style.endsWith('%')) {
       num percent = double.parse(style.substring(0, style.length - 1));
       return ((percent / 100) * parentSize).toInt();
     }
     return _toPixels(style);
   }
 }