Mandoline: Use switches::kOverrideUseGLWithOSMesaForTests.
Mandoline: Use switches::kOverrideUseGLWithOSMesaForTests.

BUG=525159

Review URL: https://codereview.chromium.org/1363713004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#350642}

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