Initial step of removing CSS zoom related properties.

sky/engine/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 493 matching lines @@
         return;
     case CSSPropertyWordSpacing:
         style->setWordSpacing(clampTo<float>(toAnimatableDouble(value)->toDouble()));
         return;
     case CSSPropertyVerticalAlign:
         style->setVerticalAlignLength(animatableValueToLength(value, state));
         return;
     case CSSPropertyZIndex:
         style->setZIndex(animatableValueRoundClampTo<int>(value));
         return;
-    case CSSPropertyZoom:
-        style->setZoom(clampTo<float>(toAnimatableDouble(value)->toDouble(), std::numeric_limits<float>::denorm_min()));
-        return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink