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We were previously appending a z value of 0px to the
specified value of transform-origin.

This is not needed, and violates the CSSOM shortest
serialization principle.

It was also inconsistent with our computed value results,
where we don't append a z value of 0px.

Bug: 905997
Change-Id: I76612a16e2048f568a6215804aa7e11469cb8e29
Reviewed-on: https://chromium-review.googlesource.com/c/1337669
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608721}