Update OWNERS

Remove people who are no longer owners. Add new owners.

Test: Compiles
Bug: 150462113
Change-Id: Ia9c353772cb1f95b430a62155b4e499a3466861b
diff --git a/libs/gralloc/OWNERS b/libs/gralloc/OWNERS
index 67743cd..4a95778 100644
--- a/libs/gralloc/OWNERS
+++ b/libs/gralloc/OWNERS
@@ -1,2 +1,2 @@
-marissaw@google.com
+chrisforbes@google.com
 vhau@google.com