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This reverts commit f0baa069.

Reason for revert: "BackgroundTest.ActiveDescendantUpdates" is flaky. Since it appears to have been added in this CL, reverting for dtseng to take another look.

Original change's description:
> Force updates to related nodes
> 
> Test: chromevox_tests. Prior to the change,
> BackgroundTest.ActiveDescendantUpdates fails because 'Selected' is not spoken.
> 
> Compute text content for list items without names
> 
> Chrome doesn't compute descendant name on focus.
> 
> Test: manually on twitter.com using j/k. Verify all text gets read.
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: Ie75dff41f98b8aa3904e435afa4bd245b9771cce
> Reviewed-on: https://chromium-review.googlesource.com/891676
> Commit-Queue: David Tseng <dtseng@chromium.org>
> Reviewed-by: Nektarios Paisios <nektar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#533960}

TBR=dtseng@chromium.org,nektar@chromium.org

Bug: 808337
Change-Id: I4f838f27aa81a607bcb83934bec0dc321d336466
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/897789Reviewed-by: Chris Pickel <sfiera@chromium.org>
Commit-Queue: Chris Pickel <sfiera@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534006}