Remove unnecessary test code on Windows.
Remove unnecessary test code on Windows.

BUG=chromium:568266,chromium:567264
R=niklas.enbom@webrtc.org

Review URL: https://codereview.webrtc.org/1506203006 .

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#10961}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: a6e4328680e263a0b5f423828ae653816f2fac70

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