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This reverts commit e9ddea61.

Reason for revert: AppWindowBrowserTest.ShouldShowStaleContentOnEviction is flaky.
https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyVwsSBUZsYWtlIkxjaHJvbWl1bUBicm93c2VyX3Rlc3RzQEFwcFdpbmRvd0Jyb3dzZXJUZXN0LlNob3VsZFNob3dTdGFsZUNvbnRlbnRPbkV2aWN0aW9uDA

Original change's description:
> Fix evicted app windows showing as empty in overview
> 
> The Files app, as well as other apps, if they're evicted due to
> being occluded by other windows, will show as empty for a second or
> more in overview until reloaded.
> 
> This CL makes them behave the same way as browser windows, that is
> they show stale contents until reloaded.
> 
> BUG=986085, 866622
> TEST=Manually, follow steps on bug, and note the issue no longer shows.
> 
> Change-Id: If9a2b26b914fe55672d15d4b560cbe6d7e996591
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711843
> Reviewed-by: kylechar <kylechar@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
> Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#682390}

TBR=sky@chromium.org,kenrb@chromium.org,lazyboy@chromium.org,rockot@google.com,afakhry@chromium.org,kylechar@chromium.org

Change-Id: I7772e1ab6134a02d2cd6ad1d312623b424339693
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 986085, 866622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729511Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682759}