Add a missing comma to the WATCHLISTS

This was missing in the following commit, breaking the syntax rules.
  https://codereview.chromium.org/764513002

[email protected], [email protected]
NOTRY=true

Review URL: https://codereview.chromium.org/762833002

Cr-Commit-Position: refs/heads/master@{#305810}
diff --git a/WATCHLISTS b/WATCHLISTS
index 5b0984f9..b8d7244 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -885,7 +885,7 @@
     'drive': ['[email protected]'],
     'drive_resource_metadata': ['[email protected]'],
     'eme': ['[email protected]'],
-    'enhanced_bookmarks' : ['[email protected]']
+    'enhanced_bookmarks': ['[email protected]'],
     'events': ['[email protected]'],
     'extension': ['[email protected]',
                   '[email protected]'],