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WMIRefresher is created during the creation of SystemMonitor on the UI
thread, it is then used only in a MayBlock sequence.

Change-Id: I7a14f59272a7ac6170c25e15518f31bfbc9f4870
Reviewed-on: https://chromium-review.googlesource.com/c/1493157
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636884}