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This param will be applied to any WebContents that are newly
created during the navigation so that the WebContents can be
properly classified before any DNS requests are made. (For
WebContents that are created for captive portal resolution in
secure mode, we need to disable secure DNS.)

Bug: 10161646
Change-Id: Ia38cd9b0d6013cae7f272cc42302bba875152e58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026349
Commit-Queue: Katharine Daly <dalyk@google.com>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738300}