…ing"

This reverts commit 0933392f84b4bb96466bd86c0e814d96f63ba137.

Reason for revert: ASAN/MSAN failures due to "use of uninitialized value"; see e.g. https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8873209606965810848/+/steps/browser_tests/0/logs/Deterministic_failure:_AllForms__x2f_FormStructureBrowserTest.DataDrivenHeuristics__x2f_148__status_FAILURE_/0

Original change's description:
> Use border box or layout overflow rect for layout shift tracking
>
> This CL addresses the following issues of layout shift tracking:
> - Changed visual overflows triggered layout shift report
>   (originally filed as crbug.com/1090763).
> - Descendant layout overflows were not included in ancestor's layout
>   shift report.
> - Unnecessary descendant layout shift report.
> - Slow visual rect calculation for LayoutInline and LayoutText.
>
> It includes the following changes
> - Track LayoutBoxes and LayoutTexts only.
> - Track both old and new starting points and visual representations
>   instead of using location of visual rects as starting points.
> - For a LayoutBox, the local visual representation is the layout
>   overflow rect if the LayoutBox has layout overflow and doesn't clip
>   overflow. Otherwise use the border box rect.
> - For a LayoutText, suppose its shift causes shift of all contents
>   in containing block logically below the LayoutText, and use that
>   part of visual representation of the containing block as the visual
>   representation of the shift.
> - Map both local starting points and local visual representations to
>   the initial containing block and viewport.
>
> This has the following benefits:
> - More accurate starting points and visual representations, conforming
>   to the specs;
> - Better performance by
>   * avoiding unnecessary layout shift reports of descendants
>   * avoiding slow LayoutInline and LayoutText visual rect calculation.
> - sizeof(LayoutObject) is reduced by 16 bytes because now we use the
>   previous geometry data in LayoutBoxes for paint invalidation.
>
> Bug: 1108622
> Change-Id: I7ebb4e250e7ca2a03b4dadea50034e300e55ad84
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319538
> Reviewed-by: Steve Kobes <skobes@chromium.org>
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#793806}

TBR=wangxianzhu@chromium.org,skobes@chromium.org,kojii@chromium.org

Change-Id: I590f2abc4a48ba65bdfe7a948ffce00b299f9e06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333578
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793874}