Add jlklein to closure watchlist

R=dbeam@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1131773007

Cr-Commit-Position: refs/heads/master@{#329771}

WATCHLISTS

@@ -911,7 +911,8 @@
                      'glider+clang@chromium.org'],
     'clipboard': ['dcheng@chromium.org'],
     'closure': ['dbeam+watch-closure@chromium.org',
-                'vitalyp+closure@chromium.org'],
+                'vitalyp+closure@chromium.org',
+                'jlklein+watch-closure@chromium.org'],
     'content': ['jam@chromium.org',
                 'darin-cc@chromium.org' ],
     'content_bluetooth': ['scheib+watch@chromium.org'],