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The cssText style serialization attempts to minimize the output by
converting different longhand declarations into a single shorthand one.
However, this shouldn't happen if the shorthand is disabled behind a
runtime flag.

BUG=876913

TEST=fast/css/inset-serialize.html

Change-Id: I264dff3352c452ab5407e34ccbcf94a519107a99
Reviewed-on: https://chromium-review.googlesource.com/1187102
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585839}