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This reverts commit 5b432a15.

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:
> Reland "Add BUILD.gn for ui/base/user_activity"
> 
> This is a reland of a230653d
> 
> There is a global singleton in user_activity which is used from
> multiple components - therefore, ui/base/user_activity itself has to
> be a component.
> 
> Original change's description:
> > Add BUILD.gn for ui/base/user_activity
> >
> > ui/base/user_activity causes ui/base to have a dependency on ui/events.
> > To remove another instance of this dependency, put user_activity into
> > its own component.
> >
> >
> > Bug: 921723
> > Change-Id: I8c82bcb82b876386c63fa263937280c48ceb43fb
> > Reviewed-on: https://chromium-review.googlesource.com/c/1448735
> > Reviewed-by: Scott Violet <sky@chromium.org>
> > Commit-Queue: Daniel Libby <dlibby@microsoft.com>
> > Cr-Commit-Position: refs/heads/master@{#628473}
> 
> Bug: 921723
> Change-Id: If80874d9cf2ae032d8931bfa3aa292b63bfa7119
> Reviewed-on: https://chromium-review.googlesource.com/c/1452996
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Daniel Libby <dlibby@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#629140}

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 921723
Change-Id: Ib3efa9a9b498e5a004ec351ddcfb9a452bd3dc23
Reviewed-on: https://chromium-review.googlesource.com/c/1478179Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Daniel Libby <dlibby@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#633567}