Remove some straggling zoom-related code.

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

Index: sky/engine/core/animation/css/CSSAnimatableValueFactory.cpp
diff --git a/sky/engine/core/animation/css/CSSAnimatableValueFactory.cpp b/sky/engine/core/animation/css/CSSAnimatableValueFactory.cpp
index 6d18fa0d31a2e3bdf5c1f44d4fc6bdadb5c1d74a..91fa062d322d42612101375d6d3fae9a35717f96 100644
--- a/sky/engine/core/animation/css/CSSAnimatableValueFactory.cpp
+++ b/sky/engine/core/animation/css/CSSAnimatableValueFactory.cpp
@@ -75,7 +75,6 @@ static PassRefPtr<AnimatableValue> createFromLength(const Length& length, const
         return AnimatableUnknown::create(CSSPrimitiveValue::create(length));
     case MaxSizeNone:
         return AnimatableUnknown::create(CSSValueNone);
-    case ExtendToZoom: // Does not apply to elements.
     case DeviceWidth:
     case DeviceHeight:
         ASSERT_NOT_REACHED();