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This CL disallows navigations to tel: URLs when the target frame
is cross-origin with respect to the frame that is initiating the
navigation.

Change-Id: If2ce2d464065414513ed646e8611a919e5339f45
Bug: 1103119
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627751Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844251}