Add COMPONENT: UI>Browser>WebUI

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: I6036e618f71cffc9af53f1876c73919b2d169f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808074
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698587}

components/version_ui_strings_grdp/OWNERS

 file://components/version_ui/OWNERS
+
+# COMPONENT: UI>Browser>WebUI