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This is a reland of 6772afd3

Tests failures in PDF tests were caused by out-of-date expectations which are now fixed.

Original change's description:
> Stops computing an artificial accessible name from inner text on Mac
>
> When an object on Mac is focusable but has no value or name, we compute its accessible description
> from its inner text.
> Unfortunately, we were adding a space between the concatenation of each piece of text coming from each child object
> which creates a mismatch between the text offsets returned by AXPosition and text markers vs. the actual text contents.
> If extra spaces are needed, they should be added by Blink, not by the browser.
> This patch removes the code that computes the inner text completely since
> no other screen reader announces focusable items unless they have an accessible name,
> and it is not proper to add an accessible name if there is none.
>
> AX-Relnotes: On Mac and same as on all other platforms, navigating by tab now does not announce
> the text contained in a large container such as a table row if that container is focusable.
>
> R=dmazzoni@chromium.org
>
> Change-Id: Iac5f321113595a2372df03bb119ab1c7a6f1bbf4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308649
> Commit-Queue: Nektarios Paisios <nektar@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#794574}

Change-Id: I04ff746943b97d76f90849da558aec7dba3022d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2356004
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Auto-Submit: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808470}