no need to pass env to ref method , we can directly use getCurrentEnv()

Summary: We can use getCurrentEnv() instead of passing environment variable around

Reviewed By: amir-shalem

Differential Revision: D17842042

fbshipit-source-id: 185b174ae7c08e746bc76c0600c2e326b15c4993

java/jni/YGJTypesVanilla.h

@@ -29,7 +29,8 @@ public:
     }
   }
 
-  ScopedLocalRef<jobject> ref(JNIEnv* env, YGNodeRef node) {
+  ScopedLocalRef<jobject> ref(YGNodeRef node) {
+    JNIEnv* env = getCurrentEnv();
     auto idx = ptrsToIdxs_.find(node);
     if (idx == ptrsToIdxs_.end()) {
       return ScopedLocalRef<jobject>(env);