Add geofflang@chromium.org to top level owners.

Remove enga who no longer works on the project.

Bug: None
Change-Id: I7e484b24fc09a73a4230504fb5568ee9341e0c14
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/217214
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/OWNERS b/OWNERS
index 21176ca..d59b3c8 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,7 +2,7 @@
 cwallez@chromium.org
 dneto@google.com
 dsinclair@chromium.org
-enga@chromium.org
+geofflang@chromium.org
 jiawei.shao@intel.com
 jrprice@google.com