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This allows it to be accessed during GetFrameHostForNavigation, which
is important for making process model decisions based on headers.

BUG=922191

Change-Id: I6e8d2ce0f56ef5329f2b8c84d7d09337524dde89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592127Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656478}