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This reverts commit 901d5088.

Reason for revert: Didn't address concerns of where this API should live. In particular DNWA isn't the right place, it should be on Widget.

Original change's description:
> Ignore window [de]activation in content_browsertests.
> 
> These events can happen when another test starts or finishes and cause
> frame/widget focus state changes, breaking some tests.
> 
> Bug: 695054
> Change-Id: I9ab6b3887c00421d4c6f96dd508e912b23706176
> Reviewed-on: https://chromium-review.googlesource.com/926368
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Commit-Queue: Alexander Semashko <ahest@yandex-team.ru>
> Cr-Commit-Position: refs/heads/master@{#543328}

TBR=sky@chromium.org,dcheng@chromium.org,jam@chromium.org,dpranke@chromium.org,ahest@yandex-team.ru

Change-Id: Ia3b8b9eabb4463ddcd22e81cec1f5ee7fffa639e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 695054
Reviewed-on: https://chromium-review.googlesource.com/963658Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543378}