ART: Move JNI files to runtime/jni/ .

Test: Rely on TreeHugger.
Change-Id: I9cae11191ef1567ae9453be498882a7767285140
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index e2e315c..f86b7a0 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -93,11 +93,11 @@
 #include "instrumentation.h"
 #include "intern_table.h"
 #include "interpreter/interpreter.h"
-#include "java_vm_ext.h"
 #include "jit/jit.h"
 #include "jit/jit_code_cache.h"
 #include "jit/profile_saver.h"
-#include "jni_internal.h"
+#include "jni/java_vm_ext.h"
+#include "jni/jni_internal.h"
 #include "linear_alloc.h"
 #include "memory_representation.h"
 #include "mirror/array.h"