Fix C# MeasureFunc test
Fix C# MeasureFunc test

Summary: Closes https://github.com/facebook/yoga/pull/533

Reviewed By: emilsjolander

Differential Revision: D4962771

Pulled By: splhack

fbshipit-source-id: 96919da73f0f35c027097259fa189b5658fb11b7

facebook/css-layout,yihuang/css-layout,facebook/yoga,yihuang/css-layout,facebook/yoga,yihuang/css-layout,facebook/css-layout,facebook/yoga,yihuang/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,yihuang/css-layout,facebook/css-layout,yihuang/css-layout,facebook/css-layout,facebook/yoga,facebook/css-layout,yihuang/css-layout,facebook/yoga,facebook/css-layout,yihuang/css-layout,facebook/css-layout,yihuang/css-layout,yihuang/css-layout,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga