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This is a reland of 9c48a1c1

Original CL: http://crrev.com/c/2208832
Revert CL: http://crrev.com/c/2247941

Reason for revert:
Causing PDFExtensionAccessiblity tests to fail on Mac Debug.

The method GetStaticTextNodeFromNode() had an assumption that highlight
node would only have one children. The original CL changed that as the
popup note is added as a child of the highlight node.

Original change's description:
> Add contents of popup note associated with a highlight in PDF accessibility tree
>
> This CL adds the note text data associated with a highlight to the
> accessibility tree. The CL makes the content of the note text accessible
> to users via screen readers.
>
> Tests have been modified to validate the addition of note text data to
> the accessibility tree.
>
> Bug: 1008775
> Change-Id: I086d039b9296d0b8ac1b13926835375a7943f8c9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208832
> Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#779008}

CQ_INCLUDE_TRYBOTS=luci.chromium.try:mac_chromium_dbg_ng

Bug: 1008775
Change-Id: If9eb9ae1a0f975b99e00e01ca68e6d301989cd93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249263Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#779572}