remove 'widows' property because paged media support is gone so this does nothing now

sky/engine/core/animation/css/CSSPropertyEquality.cpp

 // Copyright 2014 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.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/animation/css/CSSPropertyEquality.h"
 
 #include "sky/engine/core/animation/css/CSSAnimations.h"
 #include "sky/engine/core/rendering/style/DataEquivalency.h"
 #include "sky/engine/core/rendering/style/RenderStyle.h"
@@ skipping 181 matching lines @@
     case CSSPropertyPerspective:
         return a.perspective() == b.perspective();
     case CSSPropertyPerspectiveOrigin:
         return a.perspectiveOriginX() == b.perspectiveOriginX() && a.perspectiveOriginY() == b.perspectiveOriginY();
     case CSSPropertyWebkitTextStrokeColor:
         return a.textStrokeColor().resolve(a.color()) == b.textStrokeColor().resolve(b.color());
     case CSSPropertyTransform:
         return a.transform() == b.transform();
     case CSSPropertyTransformOrigin:
         return a.transformOriginX() == b.transformOriginX() && a.transformOriginY() == b.transformOriginY() && a.transformOriginZ() == b.transformOriginZ();
-    case CSSPropertyWidows:
-        return a.widows() == b.widows();
     case CSSPropertyWidth:
         return a.width() == b.width();
     case CSSPropertyWordSpacing:
         return a.wordSpacing() == b.wordSpacing();
     case CSSPropertyZIndex:
         return a.zIndex() == b.zIndex();
     default:
         ASSERT_NOT_REACHED();
         return true;
     }
 }
 
 }