Revert "a11y volume slider focus"

This reverts commit 61131c10.

Reason for revert: b/286941774, b/287013181
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:26e5361ccc3fd83b17ac0a3f24ef3b8cce05533c)
Merged-In: I422f709622002ecdf18551d53817d18bc2923a16
Change-Id: I422f709622002ecdf18551d53817d18bc2923a16