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This reverts commit 6881d10f.

Reason for revert: Introduces a use of uninitialized value.

NativeThemeBase::PaintInnerSpinButton passes |arrow| to PaintArrowButton without
initializing its |right_to_left| member.

See https://crbug.com/990672

Original change's description:
> Implemented fluent style for select multiple
> 
> -Styled the in-page select, options, and optgroups via css.
> -Modified the scrollbar to have rounded corners
> (had to plumb the zoom factor through the Scrollbar so that the native
> theme aura code can get the rounding correct at paint time)
> 
> Bug: 987292
> Change-Id: Id11d1a47fe3d5b2be01aa578aa066f80577a9bbd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715553
> Commit-Queue: Allison Pastewka <alpastew@microsoft.com>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Mason Freed <masonfreed@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#683728}

TBR=ellyjones@chromium.org,chrishtr@chromium.org,haraken@chromium.org,tkent@chromium.org,masonfreed@chromium.org,alpastew@microsoft.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 987292, 990672
Change-Id: I778b09437c79061b23de1d5e8335c8f0cf124e12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735548Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683912}