Remove msw+watch@chromium.org from the bubble watchlist.

These emails are more noise than signal for me.

BUG=NONE
TEST=NONE
R=jamescook@chromium.org

Review-Url: https://codereview.chromium.org/2831163002
Cr-Commit-Position: refs/heads/master@{#466227}

WATCHLISTS

@@ -1854,7 +1854,6 @@
                       'msramek+watch@chromium.org'],
     'bubble': ['hcarmona+bubble@chromium.org',
                'groby+bubble@chromium.org',
-               'msw+watch@chromium.org',
                'rouslan+bubble@chromium.org'],
     'cache_storage': ['jkarlin+watch@chromium.org',
                       'nhiroki@chromium.org'],