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Recent refactoring in Zucchini Trunk replaced explicit "separator"
(archive content outside matched elements) computation with "gap"
handling that occurs close to element handling. This CL removes
the now-obsolete explicit separator computation code from Zucchini
Chromium, to prepare for merging in ensemble matching code from
Trunk.

Bug: 729154
Change-Id: I7c917df058e104d8f1d518d37a673edaf0a2918c
Reviewed-on: https://chromium-review.googlesource.com/891443Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532553}