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Previously, this ran in the Task Scheduler shared worker pool and
initialized an STA on its own, which blocks initializing the shared
worker pool as an MTA.

This change moves the work to the shared COM STA task runner as 
CLSID_WSCProductList expects to be run in an STA. CLSID_WbemLocator
is fine with an STA or MTA.

BUG=706479

Change-Id: I834b0fbcda47ea0168f0ce48c5ab3191adbf7f5e
Reviewed-on: https://chromium-review.googlesource.com/745317
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512882}