Use alias_for with trivial property aliases

Source/core/css/resolver/AnimatedStyleBuilder.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 336 matching lines @@
     case CSSPropertyBorderTopRightRadius:
         style->setBorderTopRightRadius(animatableValueToLengthSize(value, state, ValueRangeNonNegative));
         return;
     case CSSPropertyBorderTopWidth:
         style->setBorderTopWidth(animatableValueRoundClampTo<unsigned>(value));
         return;
     case CSSPropertyBottom:
         style->setBottom(animatableValueToLength(value, state));
         return;
     case CSSPropertyBoxShadow:
-    case CSSPropertyWebkitBoxShadow:
         style->setBoxShadow(toAnimatableShadow(value)->shadowList());
         return;
     case CSSPropertyClip:
         style->setClip(animatableValueToLengthBox(value, state));
         return;
     case CSSPropertyColor:
         style->setColor(toAnimatableColor(value)->color());
         style->setVisitedLinkColor(toAnimatableColor(value)->visitedLinkColor());
         return;
     case CSSPropertyFillOpacity:
@@ skipping 299 matching lines @@
     case CSSPropertyRy:
         style->setRy(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
 
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink