ART: Move JNI files to runtime/jni/ .

Test: Rely on TreeHugger.
Change-Id: I9cae11191ef1567ae9453be498882a7767285140
diff --git a/runtime/native/java_lang_invoke_MethodHandleImpl.cc b/runtime/native/java_lang_invoke_MethodHandleImpl.cc
index 2e3b4d4..1f2bf09 100644
--- a/runtime/native/java_lang_invoke_MethodHandleImpl.cc
+++ b/runtime/native/java_lang_invoke_MethodHandleImpl.cc
@@ -20,7 +20,7 @@
 
 #include "art_method.h"
 #include "handle_scope-inl.h"
-#include "jni_internal.h"
+#include "jni/jni_internal.h"
 #include "mirror/field.h"
 #include "mirror/method.h"
 #include "mirror/method_handle_impl.h"