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This mojo call was added for crbug.com/811945 to fix a Windows-specific
bug. Restrict it to only be enabled on Windows.

Bug: 1042259
Change-Id: I52f1f348e1de52e2d09a376e80852e1b8ae84d23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063417Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742812}