Add wfh to watchlist for styleguide.

Change-Id: Ib3f9b44444c1829dd5ea6aba57d8a37f214b174f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3448086
Reviewed-by: Joe Mason <joenotcharles@google.com>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#968972}

WATCHLISTS

@@ -2803,7 +2803,8 @@
     'structured_headers': ['iclelland+watch@chromium.org'],
     'styleguide': ['danakj+watch@chromium.org',
                    'jbroman+cpp@chromium.org',
-                   'vmpstr+watch@chromium.org'],
+                   'vmpstr+watch@chromium.org',
+                   'wfh+watch@chromium.org'],
     'styleguide_python': ['agrieve+watch@chromium.org',
                           'wnwen+watch@chromium.org'],
     'subresource_filter': ['subresource-filter-reviews@chromium.org'],