Eli White b98bf1e097 Remove polymorphic types from StyleSheetTypes
Summary:
These types were polymorphic so that stricter types could be passed in for dimension or color. For example, color could be a union of allowed colors. However, since `rgb(0,0,0)` is a valid color, these would have to be allowed opaque types and every creator or caller of these colors would have to use a function.

This would require a massive change to every RN product in the world for negligable gain because StyleSheet values are validated at dev at runtime and cause redboxes for invalid uses.

Since we don't plan to adopt these widely, lets clean up the complexity of these types.

Reviewed By: sahrens

Differential Revision: D7158920

fbshipit-source-id: c58ae402c8248b0863c217c27153191a49c6b980
2018-03-05 18:57:30 -08:00
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