Remove sdefresne@ from ios_chrome WATCHLIST.

BUG=None

Review-Url: https://codereview.chromium.org/2849783002
Cr-Commit-Position: refs/heads/master@{#467944}

WATCHLISTS

@@ -2008,7 +2008,6 @@
     'ios': ['ios-reviews@chromium.org'],
     'ios_chrome': ['ios-reviews+chrome@chromium.org',
                    'pkl@chromium.org',
-                   'sdefresne+watch@chromium.org',
                    'noyau+watch@chromium.org',
                    'marq+watch@chromium.org'],
     'ios_clean': ['ios-reviews+clean@chromium.org',