Replace goma@ to goma member's chromium account in WATCHLIST

BUG=

Review-Url: https://codereview.chromium.org/2693413004
Cr-Commit-Position: refs/heads/master@{#451551}
diff --git a/WATCHLISTS b/WATCHLISTS
index 7b3e284..a119385 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1889,7 +1889,10 @@
     'gn': ['[email protected]',
            '[email protected]',
            '[email protected]'],
-    'goma': ['[email protected]'],
+    'goma': ['[email protected]',
+             '[email protected]',
+             '[email protected]',
+             '[email protected]'],
     'gpu': ['[email protected]'],
     'history_ui': ['[email protected]',
                    '[email protected]',