Remove broken chrome/browser/widget OWNERS file

This OWNERS file references the recently deleted
chrome/android/java/src/org/chromium/chrome/browser/widget/OWNERS
which listed only twellington as an owner, who already owns these
directories.

No-Presubmit: true
Change-Id: Ia911351e1b25cbe870c254b603b6a3f00241ee84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534397
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826823}

chrome/android/javatests/src/org/chromium/chrome/browser/widget/OWNERS

-file://chrome/android/java/src/org/chromium/chrome/browser/widget/OWNERS