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This reverts commit ffc6f22e.

Reason for revert: key events cannot reach its target with this change. Particular app cannot adjust volume via button.

Bug: Internal b/162242786
Test: manual on device

Original change's description:
> [chromecast] Enable element focus for WebContentController
> 
> Focus did not work due to two distinct problems, both of which caused
> page-level focus to be absent, which in turn meant that blink-level
> focus was suppressed.
> 
> - The aura::Window on which focus was attempted does not have an
>   OnWindowFocused observer. This change focuses the Window that does.
> 
> - Wayland app's aura::Windows are not visible. This change adds a check
>   for an ancestor that is an exo window.
> 
> Bug: b/156123509
> Test: manual on device
> Change-Id: Ib4e8a5101bbc28d2b7a0448aff8142c8cffa2a76
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274201
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
> Reviewed-by: Albert Chaulk <achaulk@chromium.org>
> Commit-Queue: Kevin Schoedel <kpschoedel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#786469}

TBR=achaulk@chromium.org,dnicoara@chromium.org,kpschoedel@chromium.org,dcastagna@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/156123509
Change-Id: Ifd988ad2469c2797d43e74c9194f2b28b7c31753
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335395
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794641}