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This reverts commit 845f18e1.

Reason for revert: 

Both `AccessibilityBridgeTest.CorrectDataSent and AccessibilityBridgeTest.DataSentWithBatching are flakily timing out.
See https://ci.chromium.org/p/chromium/builders/ci/Fuchsia%20x64 starting around 44416 (e.g. https://ci.chromium.org/p/chromium/builders/ci/Fuchsia%20x64/44418).

Original change's description:
> Reland "[Fuchsia] Send Chrome a11y updates to Fuchsia SemanticsManager"
> 
> This is a reland of fc5589ac
> 
> A BUILD.gn dep has been added back, which was causing linker failures.
> 
> Control flow in AccessibilityBridgeBrowsertests has been updated so
> tests are no longer failing.
> 
> 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}
> 
> Bug: 973095
> Change-Id: Ie6eeb74146682838efaefb0e1051d3e9442f0d86
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913569
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#715126}

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

Change-Id: Ib78d563cbbf468aaf03f1e6f00f616dc03b758a7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 973095, 1024745
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916120Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715212}