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This reverts commit c2f07278.

Reason for revert: This change is causing regression. Bounding box
calculation of a given element requires the |kScrollX| and |kScrollY|
positions. In case of PDF there is a scroll element which lives outside
the PDF node. The scroll element also reports scroll positions. During
calculation of bounding boxes in AXTree::RelativeToTreeBoundsInternal
|kScrollX| and |kScrollY| are applied twice.

Original change's description:
> Add viewport scroll information to PDFAccessibilityTree
>
> This CL adds following information to PDFAccessibilityTree
> - ax::mojom::IntAttribute::kScrollXMin
> - ax::mojom::IntAttribute::kScrollXMax
> - ax::mojom::IntAttribute::kScrollX
> - ax::mojom::IntAttribute::kScrollYMin
> - ax::mojom::IntAttribute::kScrollYMax
> - ax::mojom::IntAttribute::kScrollY
>
> It enables partial implementation of IScrollProvider, following methods
> will work with this change
> - IScrollProvider::get_HorizontallyScrollable
> - IScrollProvider::get_VerticallyScrollable
> - IScrollProvider::get_HorizontalScrollPercent
> - IScrollProvider::get_VerticalScrollPercent
>
> This information is required by Screen readers to announce the current
> scroll position and extent of scroll to the user.
>
> Tests: The best way to test this change will be through browser tests.
> However, it requires the second part of the change, detailed in the
> associated bug, to be completed.
>
> Bug: 1034521
> Change-Id: I629b2773c75f2b6b222d339cd0ae01799d695295
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985821
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Commit-Queue: Virender Singh <virens@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#728843}

TBR=dcheng@chromium.org,thestig@chromium.org,mohitb@microsoft.com,virens@microsoft.com

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

Bug: 1034521
Change-Id: I15675f9ba604be96e9c50c9bea1dbe84ef8c9a0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041714Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739108}