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/ti_method.cc b/runtime/openjdkjvmti/ti_method.cc
index 9b5b964..ab434d7 100644
--- a/runtime/openjdkjvmti/ti_method.cc
+++ b/runtime/openjdkjvmti/ti_method.cc
@@ -39,9 +39,9 @@
 #include "jni_internal.h"
 #include "mirror/object_array-inl.h"
 #include "modifiers.h"
+#include "nativehelper/ScopedLocalRef.h"
 #include "runtime_callbacks.h"
 #include "scoped_thread_state_change-inl.h"
-#include "ScopedLocalRef.h"
 #include "thread-current-inl.h"
 #include "thread_list.h"
 #include "ti_phase.h"