Remove flex shorthand getter because it doesnt make a lot of sense

Summary: It doesn't make sense to have a getter for the shorthand as it is the computed flexGrow and flexShrink values that you should care about.

Reviewed By: gkassabli

Differential Revision: D4064674

fbshipit-source-id: 69935b85042020b4e8c61a393c1be8f4d42a6674

java/com/facebook/csslayout/CSSNodeAPI.java

@@ -52,7 +52,6 @@ public interface CSSNodeAPI<CSSNodeType extends CSSNodeAPI> {
   CSSPositionType getPositionType();
   void setPositionType(CSSPositionType positionType);
   void setWrap(CSSWrap flexWrap);
-  float getFlex();
   void setFlex(float flex);
   float getFlexGrow();
   void setFlexGrow(float flexGrow);