HTTPS Previews: Fix crash in PostNewNavigation

Bug: 933665
Change-Id: I99b895de5345808b3d5ca3fcf2f78fe39bf0177a
Reviewed-on: https://chromium-review.googlesource.com/c/1478933
Auto-Submit: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633734}
1 file changed