ART: Move JNI files to runtime/jni/ .

Test: Rely on TreeHugger.
Change-Id: I9cae11191ef1567ae9453be498882a7767285140
diff --git a/openjdkjvmti/ti_heap.cc b/openjdkjvmti/ti_heap.cc
index d0a7cf0..d23370b 100644
--- a/openjdkjvmti/ti_heap.cc
+++ b/openjdkjvmti/ti_heap.cc
@@ -26,8 +26,8 @@
 #include "gc/heap.h"
 #include "gc_root-inl.h"
 #include "java_frame_root_info.h"
-#include "jni_env_ext.h"
-#include "jni_internal.h"
+#include "jni/jni_env_ext.h"
+#include "jni/jni_internal.h"
 #include "jvmti_weak_table-inl.h"
 #include "mirror/class.h"
 #include "mirror/object-inl.h"