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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/1234267Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593233}