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This CL makes the data saver checks more resilient.

Moving the checks to the very beginning at the navigation start also
prevents recording of some of the Previews histograms for
non-DRP users.

Change-Id: I26c96d654180a2202eef5f0899c89c37bf4c6da5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716121Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682836}