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It's more appropriate as the tabhelper handle urls not links.

Bug: 841615
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I7f852766712545574a1d07eeaa21e871f064a97a
Reviewed-on: https://chromium-review.googlesource.com/1053359
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557630}