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This was a recent regression. Logic was added to make a top level editable a container (so that navigation would descend into it). However, we were previously using the container predicate to decide whether or not to set focus; this prevents focus() on roots which sometimes triggered other side effects such as focusing a descendant.

Make the focus precondition check the structuralContainer predicate instead.

BUG=640587
TEST=chromevox_tests

Review-Url: https://codereview.chromium.org/2273373002
Cr-Commit-Position: refs/heads/master@{#414871}