ART: Move JNI files to runtime/jni/ .

Test: Rely on TreeHugger.
Change-Id: I9cae11191ef1567ae9453be498882a7767285140
diff --git a/openjdkjvmti/ti_threadgroup.cc b/openjdkjvmti/ti_threadgroup.cc
index c0597ad..e17e61f 100644
--- a/openjdkjvmti/ti_threadgroup.cc
+++ b/openjdkjvmti/ti_threadgroup.cc
@@ -37,7 +37,7 @@
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "handle_scope-inl.h"
-#include "jni_internal.h"
+#include "jni/jni_internal.h"
 #include "mirror/class.h"
 #include "mirror/object-inl.h"
 #include "mirror/string.h"