Add danakj@ to //third_party/public/blink/OWNERS

Change-Id: Ic7b137d39ac73f280c307e0af53125df957451c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088015Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747015}

third_party/blink/public/OWNERS

 chrishtr@chromium.org
+danakj@chromium.org
 dcheng@chromium.org
 dgozman@chromium.org
 dtapuska@chromium.org