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1. Extend Expiration for Settings.StartupPageLoadSettings

2. Remove Settings.StartupPageLoadURLs

Bug: 986512
Change-Id: I0a1a6893cb6594756537d6ed73380b69ee86d16e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772424Reviewed-by: Ramya Nagarajan <ramyan@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: proberge <proberge@chromium.org>
Commit-Queue: proberge <proberge@chromium.org>
Auto-Submit: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691146}