Add masonfreed as OWNER of core/html/forms

Change-Id: I9aaae6c438fad8a1c8141fb6acf6d10bd6f2629c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906114
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714071}

third_party/blink/renderer/core/html/forms/OWNERS

 keishi@chromium.org
 tkent@chromium.org
+masonfreed@chromium.org
 
 # TEAM: dom-dev@chromium.org
 # COMPONENT: Blink>Forms