Rename vmData

Change-Id: I34e49e56187bbb27cb892721084f6d69c2eaacce
diff --git a/src/well_known_classes.h b/src/well_known_classes.h
index d9acf2d..8170520 100644
--- a/src/well_known_classes.h
+++ b/src/well_known_classes.h
@@ -90,7 +90,7 @@
   static jfieldID java_lang_Thread_name;
   static jfieldID java_lang_Thread_priority;
   static jfieldID java_lang_Thread_uncaughtHandler;
-  static jfieldID java_lang_Thread_vmData;
+  static jfieldID java_lang_Thread_nativePeer;
   static jfieldID java_lang_ThreadGroup_mainThreadGroup;
   static jfieldID java_lang_ThreadGroup_name;
   static jfieldID java_lang_ThreadGroup_systemThreadGroup;