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Enables WebKit based side swipe, and only enables Chrome side swipe when the
page swiped page is to or from an NTP.

This reverts commit 1baa2855.

Change-Id: If29fd2c98bf475bfe9251e3eae18b24cb9c9c773
Reviewed-on: https://chromium-review.googlesource.com/c/1352958Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612289}