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/native/java_lang_Class.cc b/runtime/native/java_lang_Class.cc
index d3377be..1a19940 100644
--- a/runtime/native/java_lang_Class.cc
+++ b/runtime/native/java_lang_Class.cc
@@ -18,8 +18,6 @@
 
 #include <iostream>
 
-#include "nativehelper/jni_macros.h"
-
 #include "art_field-inl.h"
 #include "art_method-inl.h"
 #include "base/enums.h"
@@ -28,7 +26,6 @@
 #include "dex_file-inl.h"
 #include "dex_file_annotations.h"
 #include "jni_internal.h"
-#include "nth_caller_visitor.h"
 #include "mirror/class-inl.h"
 #include "mirror/class_loader.h"
 #include "mirror/field-inl.h"
@@ -37,12 +34,14 @@
 #include "mirror/object_array-inl.h"
 #include "mirror/string-inl.h"
 #include "native_util.h"
+#include "nativehelper/jni_macros.h"
+#include "nativehelper/ScopedLocalRef.h"
+#include "nativehelper/ScopedUtfChars.h"
+#include "nth_caller_visitor.h"
 #include "obj_ptr-inl.h"
 #include "reflection.h"
-#include "scoped_thread_state_change-inl.h"
 #include "scoped_fast_native_object_access-inl.h"
-#include "ScopedLocalRef.h"
-#include "ScopedUtfChars.h"
+#include "scoped_thread_state_change-inl.h"
 #include "utf.h"
 #include "well_known_classes.h"