ART: More header cleanup - jni_internal.h

Move jni_macros.h to the clients (users of RegisterNativeMethods).

Test: mmma art
Change-Id: I052ac9f703ec69f0a2df1efcaf9f4a450eb7be1c
diff --git a/runtime/native/java_lang_Class.cc b/runtime/native/java_lang_Class.cc
index 4f99947..9e07a5c 100644
--- a/runtime/native/java_lang_Class.cc
+++ b/runtime/native/java_lang_Class.cc
@@ -18,6 +18,8 @@
 
 #include <iostream>
 
+#include "nativehelper/jni_macros.h"
+
 #include "art_field-inl.h"
 #include "art_method-inl.h"
 #include "base/enums.h"