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This reverts commit fc5589ac.

Reason for revert: compile failures on fuschia-x64-dbg
https://cr-buildbucket.appspot.com/build/8896967608768520752

Original change's description:
> [Fuchsia] Send Chrome a11y updates to Fuchsia SemanticsManager
> 
> This change adds functionality to the Accessibility Bridge:
> * Listens for change in AccessibilityMode from Fuchsia
> * Gets the semantic tree from Chrome accessibility and sends it to the
> SemanticsManager
> * Sends live updates when nodes are added, updated or removed
> 
> To send updates, this change includes the following:
> * Creates a ViewRefPair and registers it with the SemanticsManager
> * Initialize an AccessibilityBridge
> * Listen for changes in the Chrome Accessibility tree, serializes them
> to Fuchsia data structures and sends that data to the Fuchsia
> SemanticsManager
> 
> Testing: Added AccessibilityBridge browsertests.
> 
> Bug: 973095
> Change-Id: I89658288b846b6b9ce84a04e49434ec266b84dfc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787171
> Commit-Queue: Sharon Yang <yangsharon@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#714588}

TBR=dtseng@chromium.org,kmarshall@chromium.org,yangsharon@chromium.org

Change-Id: If2774f0bc5d9a27dc8ba5af3ee00c608e0f6b786
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 973095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913211Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714632}