Remove custom style building functions for 'clip'.

Source/core/animation/css/CSSAnimatableValueFactory.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 305 matching lines @@
     case CSSPropertyBorderTopRightRadius:
         return createFromLengthSize(style.borderTopRightRadius(), style);
     case CSSPropertyBorderTopWidth:
         return createFromDouble(style.borderTopWidth());
     case CSSPropertyBottom:
         return createFromLength(style.bottom(), style);
     case CSSPropertyBoxShadow:
     case CSSPropertyWebkitBoxShadow:
         return AnimatableShadow::create(style.boxShadow());
     case CSSPropertyClip:
-        if (style.hasClip())
-            return createFromLengthBox(style.clip(), style);
-        return AnimatableUnknown::create(CSSPrimitiveValue::create(CSSValueAuto));
+        if (style.hasAutoClip())
+            return AnimatableUnknown::create(CSSPrimitiveValue::create(CSSValueAuto));
+        return createFromLengthBox(style.clip(), style);
     case CSSPropertyColor:
         return createFromColor(property, style);
     case CSSPropertyFillOpacity:
         return createFromDouble(style.fillOpacity());
     case CSSPropertyFill:
         return AnimatableSVGPaint::create(
             style.svgStyle().fillPaintType(), style.svgStyle().visitedLinkFillPaintType(),
             style.svgStyle().fillPaintColor(), style.svgStyle().visitedLinkFillPaintColor(),
             style.svgStyle().fillPaintUri(), style.svgStyle().visitedLinkFillPaintUri());
     case CSSPropertyFlexGrow:
@@ skipping 167 matching lines @@
     case CSSPropertyZoom:
         return createFromDouble(style.zoom());
     default:
         ASSERT_NOT_REACHED();
         // This return value is to avoid a release crash if possible.
         return AnimatableUnknown::create(nullptr);
     }
 }
 
 } // namespace blink