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Currently, Viewport-Width hints send the display width for navigation
requests, rather than the actual viewport width.
This CL fixes that for iframes and for new windows that have the same
viewport as their opener.

Bug: 825892
Change-Id: Ib01f394325ed3753b9a89dbdbcada1db0d3b029c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494876
Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826750}