Fix benchmark

Summary: It was always a mistake to have a measure function here but the recent addition of an assertion made us notice it.

Reviewed By: splhack

Differential Revision: D4156754

fbshipit-source-id: 98fcea6e233cb4f5706ebca37028c8d67edb4c09

benchmark/CSSBenchmark.c

@@ -59,7 +59,6 @@ CSS_BENCHMARKS({
 
     for (uint32_t i = 0; i < 10; i++) {
       const CSSNodeRef child = CSSNodeNew();
-      CSSNodeSetMeasureFunc(child, _measure);
       CSSNodeStyleSetFlex(child, 1);
       CSSNodeInsertChild(root, child, 0);