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This reverts commit 3e4749d2.

Reason for revert: This change is no longer needed - we are no longer
planning on removing the dependency from ui/base to ui/events

Original change's description:
> Create BUILD.gn in ui/base/idle
>
> This one step in a series of clean up refactoring changes
> that will result in ui/base no longer having dependencies on
> ui/events. This will allow ui/base to be treated more as the lowest
> layer of the ui/ components.
>
> This change adds a BUILD.gn to ui/base/idle to create a new
> component. This is in preparation of doing the same for
> ui/base/user_activity which has a dependency on ui/events
> (and on which ui/base/idle has a dependency).
>
> Bug: 921723
> Change-Id: I1b98d33ce8dfd78309fd532cbfc2bb013453c83f
> Reviewed-on: https://chromium-review.googlesource.com/c/1428563
> Commit-Queue: Daniel Libby <dlibby@microsoft.com>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#627720}

TBR=sadrul@chromium.org,sky@chromium.org,dcheng@chromium.org,dlibby@microsoft.com

Bug: 921723
Change-Id: I80080945da2f2726ce79b477644b65e82b0e2ff2
Reviewed-on: https://chromium-review.googlesource.com/c/1478252Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Daniel Libby <dlibby@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#633859}