art: use proper nativehelper headers

libnativeheader exports headers under nativeheader. These were
available before incorrectly as global headers in order to give
access to jni.h.

Test: modules using art find headers
Bug: 63762847
Change-Id: I5c820d677e94e07b2859e78610bc997fe51b41dc
diff --git a/runtime/openjdkjvmti/jvmti_weak_table-inl.h b/runtime/openjdkjvmti/jvmti_weak_table-inl.h
index 64ab3e7..a640acb 100644
--- a/runtime/openjdkjvmti/jvmti_weak_table-inl.h
+++ b/runtime/openjdkjvmti/jvmti_weak_table-inl.h
@@ -44,8 +44,8 @@
 #include "jvmti_allocator.h"
 #include "mirror/class.h"
 #include "mirror/object.h"
+#include "nativehelper/ScopedLocalRef.h"
 #include "runtime.h"
-#include "ScopedLocalRef.h"
 
 namespace openjdkjvmti {