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/compiler/jni/jni_compiler_test.cc b/compiler/jni/jni_compiler_test.cc
index 6ce7d75..6c7baf0 100644
--- a/compiler/jni/jni_compiler_test.cc
+++ b/compiler/jni/jni_compiler_test.cc
@@ -32,12 +32,12 @@
 #include "mem_map.h"
 #include "mirror/class-inl.h"
 #include "mirror/class_loader.h"
-#include "mirror/object_array-inl.h"
 #include "mirror/object-inl.h"
+#include "mirror/object_array-inl.h"
 #include "mirror/stack_trace_element.h"
+#include "nativehelper/ScopedLocalRef.h"
 #include "nativeloader/native_loader.h"
 #include "runtime.h"
-#include "ScopedLocalRef.h"
 #include "scoped_thread_state_change-inl.h"
 #include "thread.h"