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This reverts commit e392dddd.

Reason for revert:
Follow-up design discussions with dmazzoni and dtseng suggest that
this might not be the right direction to go.

Instead we might want to use AXHostService as the way that both
out-of-process ash and remote app windows/widgets talk to the
browser. We may also have a different mechanism for assigning
AX child tree IDs per-widget.

Original change's description:
> chromeos: Move AXHostService into ash
> 
> This is a step toward supporting multiple remote apps and widgets. We
> need this for browser windows under single-process-mash.
> 
> Under mash the ash process is responsible for top-level window creation
> for remote apps. It will need to route accessibility actions (like hit
> testing) to the correct remote app. Likewise it manages window frames
> and focus. Therefore it should own the mojo AXHostService, not the
> browser.
> 
> Accessibility events from the remote app must be routed out of ash
> into chrome to the accessibility extension. For now we do this with
> the in-process AccessibilityDelegate. I didn't introduce a new delegate
> because the mojo service is lazily created and it's hard to connect
> a new delegate at startup. Subsequent CLs will:
> * Always create the service at ash startup
> * Convert the delegate methods to mojo
> 
> See go/mash-ax-node-tree for the full plan.
> 
> Bug: 888147
> Test: ash_unittests, manually use ChromeVox and STS with shortcut viewer
> Change-Id: Ia9e63689a8cb407b66397778be4617479fdf6c92
> Reviewed-on: https://chromium-review.googlesource.com/1249920
> Commit-Queue: James Cook <jamescook@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594949}

TBR=jamescook@chromium.org,sky@chromium.org,dtseng@chromium.org

Change-Id: I156656b5114a28693308252ee531bbf4c3db867a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 888147
Reviewed-on: https://chromium-review.googlesource.com/1252629Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595203}