Add twellington@ to NTP owners

BUG=

Change-Id: I6703327b25eac404261e920944693b76450b6f90
Reviewed-on: https://chromium-review.googlesource.com/970902Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544414}

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

@@ -2,6 +2,7 @@ dgn@chromium.org
 mvanouwerkerk@chromium.org
 peconn@chromium.org
 tedchoc@chromium.org
+twellington@chromium.org
 
 # TEAM: ntp-dev@chromium.org
 # COMPONENT: UI>Browser>NewTabPage