Remove myself from chrome/browser/ui/webui/downloads/OWNERS

R=qinmin@chromium.org

Bug: None
Change-Id: I30174f066b72f3f6a7930ebe0509efb06738397f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808434Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697486}

chrome/browser/ui/webui/downloads/OWNERS

 file://components/download/OWNERS
 
-asanka@chromium.org
 dbeam@chromium.org
 
 per-file *.mojom=set noparent