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ui::AXTree contains owned pointers which it is responsible for freeing,
copying this is therefore non-trivial and we don't define our own copy
constructor.

R=aboxhall,dmazzoni

Change-Id: Iecbec9fc69c56dff96d3640f83abb6ef783ca1a5
Reviewed-on: https://chromium-review.googlesource.com/c/1358112
Commit-Queue: Chris Hall <chrishall@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613383}