Add COMPONENT to ios/web/navigation/OWNERS.

UI>Browser>Navigation is the most appropriate component for this
directory.

Bug: None
Change-Id: I6a639892931977244188948011553c56c087fe00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1665557
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670233}

ios/web/navigation/OWNERS

@@ -5,3 +5,4 @@ kkhorimoto@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org
 # OS: iOS
+# COMPONENT: UI>Browser>Navigation
\ No newline at end of file