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This reverts commit fd1c45a7.

Reason for revert: Causing test AccessibilityActionBrowserTest.IncrementDecrementActions to fail. See for example https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/19799.

Original change's description:
> Use PaintInvalidator to optimize AX bounding boxes
> 
> Previously, any time there was a layout, the accessibility
> serialization code would scan every AXObject to see if any
> needed to update their bounding box.
> 
> Instead, replace this with a mechanism that uses
> PaintInvalidator to mark AXObjects that might have
> dirty bounding boxes.
> 
> Existing tests already provide some coverage; if you
> comment out the code in paint_invalidator.cc, a
> handful of browser tests fail.
> 
> To provide even more coverage, a debug-only check
> walks the entire tree and ensures that no nodes
> have incorrect bounding boxes. If you try commenting
> out the code in paint_invalidator.cc now, hundreds
> of browser tests fail. This provides some good
> confidence that it's working correctly.
> 
> Finally, add a new blink perf test demonstrating a
> simple scenario where this results in a dramatic
> speedup, just by focusing links in a document with a
> few thousand nodes.
> 
> Bug: 1109081
> AX-Relnotes: makes accessibility less sluggish on very large web pages
> 
> Change-Id: I51a89d0b37ff356c5443b324080acefe0e7f3fbf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319411
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Nektarios Paisios <nektar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792949}

TBR=dmazzoni@chromium.org,wangxianzhu@chromium.org,aboxhall@chromium.org,haraken@chromium.org,nektar@chromium.org

Change-Id: I3f44fc1c97dbe1690b881cb233b46f060f49ca72
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1109081
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326560Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793039}