Move casts.h and stl_util.h into base/.

Change-Id: Idb3bfa5cec3d146e488031d91265737cde2b4cf4
diff --git a/src/scoped_thread_state_change.h b/src/scoped_thread_state_change.h
index c0fb649..5eabbdf 100644
--- a/src/scoped_thread_state_change.h
+++ b/src/scoped_thread_state_change.h
@@ -17,7 +17,7 @@
 #ifndef ART_SRC_SCOPED_THREAD_STATE_CHANGE_H_
 #define ART_SRC_SCOPED_THREAD_STATE_CHANGE_H_
 
-#include "casts.h"
+#include "base/casts.h"
 #include "jni_internal.h"
 #include "thread.h"