ART: Move JNI files to runtime/jni/ .

Test: Rely on TreeHugger.
Change-Id: I9cae11191ef1567ae9453be498882a7767285140
diff --git a/runtime/native/java_lang_VMClassLoader.cc b/runtime/native/java_lang_VMClassLoader.cc
index 44585fc..0630737 100644
--- a/runtime/native/java_lang_VMClassLoader.cc
+++ b/runtime/native/java_lang_VMClassLoader.cc
@@ -20,7 +20,7 @@
 #include "class_linker.h"
 #include "dex/descriptors_names.h"
 #include "dex/dex_file_loader.h"
-#include "jni_internal.h"
+#include "jni/jni_internal.h"
 #include "mirror/class_loader.h"
 #include "mirror/object-inl.h"
 #include "native_util.h"