Remove duplicate declaration of YGRoundValueToPixelGrid from Yoga-internal.h

Summary:
@public

Removes the declaration of `YGRoundValueToPixelGrid` from `Yoga-internal.h`, as it is already declared in `Yoga.h`. `Yoga.h` is included from `Yoga-internal.h`

Reviewed By: SidharthGuglani

Differential Revision: D16047832

fbshipit-source-id: 72d9d2510372c983eedacc5d7af406b9346f18e6

Author: davidaurelio

ReactCommon/yoga/yoga/Yoga-internal.h

@@ -16,12 +16,6 @@ using YGVector = std::vector<YGNodeRef>;
 
 YG_EXTERN_C_BEGIN
 
-WIN_EXPORT float YGRoundValueToPixelGrid(
-    const float value,
-    const float pointScaleFactor,
-    const bool forceCeil,
-    const bool forceFloor);
-
 void YGNodeCalculateLayoutWithContext(
     YGNodeRef node,
     float availableWidth,