Remove GetAlignmentShorthandValue() and BorderSpacingValue()

These functions were functionally equivalent to Get2Values(), but were
only used for their respective shorthands. Remove both in favor of
Get2Values().

Change-Id: Icae9c96ee97bb1d45cf6bd7d7bc00879597f79d0
Reviewed-on: https://chromium-review.googlesource.com/1023127
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Chris Nardi <cnardi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552576}
2 files changed