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Small followup from https://codereview.chromium.org/423333002

This allows the test to compile on a greater range of toolchains (some
of which break when using types defined in a function with arraysize).

Review URL: https://codereview.chromium.org/456403002

Cr-Commit-Position: refs/heads/master@{#289051}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289051 0039d316-1c4b-4281-b951-d872f2087c98