Add mdjones@ as owner of FeatureHighlightProvider.java

Bug: 
Change-Id: If7d4dfd554bb9224f3f12266f1bfdab99040225e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910802
Auto-Submit: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714500}

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

 twellington@chromium.org
 
+per-file FeatureHighlightProvider.java=mdjones@chromium.org
 per-file ToolbarProgressBar*=mdjones@chromium.org
 per-file ScrimView.java=mdjones@chromium.org