Add COMPONENT to ios/web/session/OWNERS.

UI>Browser>Sessions is the most appropriate component

Bug: None
Change-Id: I356fca2650c6339e299801b60b9479d729dce46a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1665475
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@{#670231}

ios/web/session/OWNERS

@@ -3,3 +3,4 @@ kkhorimoto@chromium.org
 
 # TEAM: ios-directory-owners@chromium.org
 # OS: iOS
+# COMPONENT: UI>Browser>Sessions