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AXPlatformNodeDelegate::GetFocus() returns the node within the called
node's subtree that currently has focus. When an element in web content
has focus, and a delegate in Views is asked for focus, that delegate can
only reach as far as the web content root. Calling GetFocus() again on
the web content root ensures that the platform API returns the currently
focused node.

Bug: 928811
Change-Id: Ice47eed0a8ea4281beb48624942ac2428fb1950f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099162Reviewed-by: Ian Prest <iapres@microsoft.com>
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#749386}