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This change only reflects updates to Android-specific
code. Substituting recently implemented
AXNode::GetPosInSet() and AXNode::GetSetSize() functions
when posinset and setsize computations are necessary.

Change-Id: I6cd876921cd1ab8cc6f47f058dcfc88d7c365897
Reviewed-on: https://chromium-review.googlesource.com/c/1361654
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614747}