Adding some download folks to chrome/browser/android/download OWNERS

Change-Id: Ib0c55d8584eaf1a63fb65c98d066a92b2a33338c
Reviewed-on: https://chromium-review.googlesource.com/1132081Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573848}

chrome/browser/android/download/OWNERS

+qinmin@chromium.org
+xingliu@chromium.org
+shaktisahu@chromium.org
+
 per-file manifest.json=set noparent
 per-file manifest.json=file://ipc/SECURITY_OWNERS