libsystem/libsync: Update OWNERS

marissaw@ is leaving Android.

Test: Compiles
Bug: 150462113
Change-Id: I63334466cc1b429c16f0011dcf4b43aa92324a6c
diff --git a/libsync/OWNERS b/libsync/OWNERS
index dc61733..e75b15b 100644
--- a/libsync/OWNERS
+++ b/libsync/OWNERS
@@ -1,3 +1,3 @@
-ghackmann@google.com
+chrisforbes@google.com
+hridya@google.com
 jessehall@google.com
-marissaw@google.com