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This reverts commit 217c3a78.

Reason for revert: <INSERT REASONING HERE>
crbug.com/1016132

Original change's description:
> Makes magnifier observe AXEventManager for focus changes
> 
> Bug: 865575
> Change-Id: I8d8328a459d7621d6fc0a0d65e0f24f788b9767f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852414
> Commit-Queue: David Tseng <dtseng@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#704854}

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

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

Bug: 865575,1016132
Change-Id: Id77035499da1e2b36c1216b622eb8f341449406b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875449Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708525}