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This reverts commit a471ff9b.

Reason for revert: DumpAccessibilityEventsTest.AccessibilityEventsMenuListCollapse* are still flaking on Win7 bots.
https://ci.chromium.org/p/chromium/builders/ci/Win7%20Tests%20%281%29/100813
https://ci.chromium.org/p/chromium/builders/ci/Win%207%20Tests%20x64%20%281%29/65070

Original change's description:
> Reland "Ensure UI Automation GetFocus reaches focused node in web content"
> 
> This is a reland of 756820dd
> 
> The original CL was reverted due to test failures on Win7.
> 
> On both Win10 and Win7, UI Automation was generating an initial focus
> event when the test listener first connects. On Win10, this initial
> focus event comes from a window managed by the operating system
> (ClassName=ApplicationManager_ImmersiveShellWindow). Since that element
> is outside the scope of the test app, the test listener throws it out.
> On Win7, the initial focus event comes from an element in our web
> content, so the test listener logs it.
> 
> My suspicion is that the difference in behavior is due to mitigations
> for focus stealing introduced between Win7 and Win10. Regardless, the
> fix is to generate separate expectation files for Win7.
> 
> Original change's description:
> > Ensure UI Automation GetFocus reaches focused node in web content
> >
> > 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/+/2099162
> > Reviewed-by: Ian Prest <iapres@microsoft.com>
> > Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
> > Cr-Commit-Position: refs/heads/master@{#749386}
> 
> Bug: 928811
> Change-Id: I32e59febfb6dbb7b5386c155c252c880a0f2ebc5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2101930
> Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
> Reviewed-by: Ian Prest <iapres@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#750781}

TBR=kbabbitt@microsoft.com,iapres@microsoft.com

Change-Id: I064dad632ef4379f6132e4d1a2f17bd558e8293e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 928811
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105691Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750895}