remove YGMarker code

Summary: Removes code for now unused marker based approach

Reviewed By: davidaurelio

Differential Revision: D16048800

fbshipit-source-id: 228e0e906252782ee0bed543728b666d1f9cc854

yoga/YGConfig.h

@@ -5,7 +5,6 @@
  * file in the root directory of this source tree.
  */
 #pragma once
-#include "YGMarker.h"
 #include "Yoga-internal.h"
 #include "Yoga.h"
 
@@ -44,7 +43,6 @@ public:
   std::array<bool, facebook::yoga::enums::count<YGExperimentalFeature>()>
       experimentalFeatures = {};
   void* context = nullptr;
-  YGMarkerCallbacks markerCallbacks = {nullptr, nullptr};
 
   YGConfig(YGLogger logger);
   void log(YGConfig*, YGNode*, YGLogLevel, void*, const char*, va_list);