Disable layout test helper on windows
Disable layout test helper on windows

Disable the layout_test_helper binary on windows as it is only used to
control font smoothing, a task now handled by content_shell directly.

R=dpranke@chromium.org
BUG=356780

Review URL: https://codereview.chromium.org/226693008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@171001 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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