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This reverts commit a351b484.

Reason for revert: MemorySanitizer: use-of-uninitialized-value.

New struct members added to PP_PrivateAccessibilityViewportInfo seem to remain uninitialized in PdfAccessibilityTreeTest.TestZoomAndScaleChanges.

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: I11067b2af4d5bd73e62d89c8ce86fb00b5f3f7ec
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1969412
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
> Commit-Queue: Virender Singh <virens@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#727858}

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

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

Bug: 1034521
Change-Id: If82ca15040193884cd03891419d7065da425fcf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985011Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727956}