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This code was used for Win8 non-aura builds. Now it's dead.
metro_driver should be cleared separately as it has a lot of stuff excluded from build.

BUG=142330
NOTRY=true
R=mad@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/524543002

Cr-Commit-Position: refs/heads/master@{#292683}