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This reverts commit 8ce1863f.

Reason for revert: speculative revert to fix CrOS MSan build, see crbug.com/824097.

Original change's description:
> Turn on native notifications by default for Chrome OS.
> 
> They're already on by default for Mash. This makes Chrome use the mojo
> ("native") interface for notifications even in non-Mash.
> 
> Bug: 578868
> Change-Id: If1ee85e2136dc0480ccee9a57835b0ffb9b47b8b
> Reviewed-on: https://chromium-review.googlesource.com/963518
> Commit-Queue: Evan Stade <estade@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#544395}

TBR=stevenjb@chromium.org,estade@chromium.org

Change-Id: I044bbe505034ccb6da615163f6cbe74e7b164f6a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 578868
Reviewed-on: https://chromium-review.googlesource.com/973006Reviewed-by: Alexander Potapenko <glider@chromium.org>
Commit-Queue: Alexander Potapenko <glider@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544664}