Update `OWNERS` files under `dalvik`.

Test: n/a
Change-Id: Icf86249dfc5e9098e968f1ef70fe0ad4416cae4d
diff --git a/OWNERS b/OWNERS
index ca996c4..f84c3f6 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,8 +2,6 @@
 gavra@google.com
 cmw@google.com
 # ART / libcore
-calin@google.com
 dsrbecky@google.com
 narayan@google.com
 ngeoffray@google.com
-oth@google.com