column-gap:normal is not supposed to be interpolable.

Bug: 798338
Test: http://w3c-test.org/css/css-multicol/multicol-gap-animation-003.html
Change-Id: I352b6a7de8893b27711c178abf7e1ac291429dc3
Reviewed-on: https://chromium-review.googlesource.com/847476
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526652}
3 files changed