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This is a reland of 45fe0314

Original change's description:
> a11y insepct reorg: move PropertyNode class to ui/accessibility
>
> Bug: 1133330
> Change-Id: I9103d0116c5822a0f9dc291a7a87bd5f902a4efa
> AX-Relnotes: n/a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519755
> Commit-Queue: Alexander Surkov <asurkov@igalia.com>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825789}

Bug: 1133330
Change-Id: I6608770602770255d6c7033fd3d70e373de43f5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529749Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#825905}