Remove reference to TranslateInfoBarDelegate from PolicyTest.TranslateEnabled
Remove reference to TranslateInfoBarDelegate from PolicyTest.TranslateEnabled

Translate doesn't use infobars in Aura. This was breaking the UBSan
VPtr build config, because it tries to access the typeinfo for
TranslateInfoBarDelegate, causing a link error because
translate_infobar_delegate.cc isn't built.

BUG=541755, 383235

Review URL: https://codereview.chromium.org/1409133004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#357467}

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