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This implements https://github.com/w3c/wake-lock/pull/242.

WakeLockEvent just duplicates functionality that is available in Event
itself, so just emit Events instead.

ev.lock can be accessed via ev.target, which comes from Event itself.

Bug: 1015320
Change-Id: Iadb4d48629520605bdb4332bb02a62d022fab16e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865347
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#706975}