[Auto-disable Accessibility] Make WindowAndroid listen to AccessibilityState

This CL continues the work of unifying the accessibility state in
Clank.

With this CL we remove the hard dependency of WindowAndroid on
AccessibilityManager and TouchExplorationStateChange. These can
both be monitored through AccessibilityState. The original
bug this code was trying to fix was fixed in the EventForwarder
change in the previous CL: crrev.com/c/4544402 . The bug no
longer reproduces with or without this code, and manual testing
does not show any regressions, so the code has been removed.


AX-Relnotes: N/A
Bug: 1430202, b/265493191
Change-Id: I9e72b35c8819b3a2a3ae026344e789b212e4923c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4529395
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1152076}