Fix crash when animating -webkit-{min,max}-content keyword

Source/core/css/resolver/StyleBuilderConverter.cpp

Index: Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/Source/core/css/resolver/StyleBuilderConverter.cpp b/Source/core/css/resolver/StyleBuilderConverter.cpp
index 75b3a6c10977c0ee2f40c4b100cec5a181b02f35..613b864a22c1f6320298c834f4daff08e4f7a7a9 100644
--- a/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -557,8 +557,10 @@ Length StyleBuilderConverter::convertLengthSizing(StyleResolverState& state, CSS
         return Length(Intrinsic);
     case CSSValueMinIntrinsic:
         return Length(MinIntrinsic);
+    case CSSValueMinContent:
     case CSSValueWebkitMinContent:
         return Length(MinContent);
+    case CSSValueMaxContent:
     case CSSValueWebkitMaxContent:
         return Length(MaxContent);
     case CSSValueWebkitFillAvailable: