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Since this unit test requires WinRT which only exists on Windows 8 or above,
we don't run it on Windows 7 bots.

Bug: 734095
Change-Id: I6889efb1e9425fe3cc4ae37ae6b0f0d54e7c4f5a
Reviewed-on: https://chromium-review.googlesource.com/915016
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536906}