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crrev.com/c/2364049 fixed changed "GetChildCount" to return 0 for any
node that is a leaf, and portals are considered leaf nodes (with prune
tree enabled on Android) [1].

[1] https://source.chromium.org/chromium/chromium/src/+/master:content/browser/accessibility/browser_accessibility_android.cc;l=450;drc=6e8b402a6231405b753919029c9027404325ea00

Bug: 1120210
Change-Id: I021197d1f06ce92a1752f43c0aff85e9e66665f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391641
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805390}