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This reverts commit 33d3164a.

Reason for revert: Breaks NVDA / JAWS

Original change's description:
> Ensure Windows accessibility is enabled properly.
> 
> http://crrev.com/c/1192062 made it so that we don't enable accessibility
> as often. The idea was to only enable accessibility if we get a call to
> IAccessible2, or to both get_accName and a response to our alert message
> on a honeypot window.
> 
> However, this only worked if we constructed at least one
> BrowserAccessibilityManager. In cases where the external client
> never explored and discovered a BrowserAccessibilityManager, the
> IAccessible2UsageObserver wasn't registered yet.
> 
> As a fix, move the IAccessible2UsageObserver code to part of
> BrowserAccessibilityStateImpl.
> 
> Bug: 878072
> Change-Id: Iadcbd032fa1d6f635bbb99c1e130d384efe0d9b1
> Reviewed-on: https://chromium-review.googlesource.com/1234267
> Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#593233}

TBR=dmazzoni@chromium.org,aleventhal@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 878072
Change-Id: I482cb7e3fa19f5f6357c4bc28f44cb20272142cd
Reviewed-on: https://chromium-review.googlesource.com/1240473Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593574}