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When the page is preloaded, a session restoration is done.
But the "visible" page isn't loaded as it would in a normal session
restoration.
This CL makes sure that this page gets the correct UA.

Bug: 1100852
Change-Id: Ia666dd17e512c8d9c7e84e750722dae90f56ca14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279757
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791785}