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This reverts commit 5aa7731c.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 619843 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vNWFhNzczMWMzMDc1ZmU2M2QxZjAxNjI1MmZjMDk0YmJhMTQ5MWQxNww

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.win/Win10%20Tests%20x64/30552

Sample Failed Step: network_service_browser_tests on Windows-10-15063

Sample Flaky Test: CrExtensionsManagerTestWithOptionsDialog.ShowOptionsDialog

Original change's description:
> Extensions: Focus correct button on options dialog close.
> 
> Also fix some const references surfaced by presubmit.
> 
> Bug: 912026
> Change-Id: I2661f69f0e63e613a9b8e9d565813c3e27fed340
> Reviewed-on: https://chromium-review.googlesource.com/c/1377494
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Commit-Queue: Hector Carmona <hcarmona@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#619843}

Change-Id: I66ae0de35342e94b47e76dac658df2eb1f12e4b0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 912026, 919007
Reviewed-on: https://chromium-review.googlesource.com/c/1395717
Cr-Commit-Position: refs/heads/master@{#619870}