Fix OptionsUITest for Chrome OS.
Fix OptionsUITest for Chrome OS.

I thought the compiler could catch errors like that,
but apparently I was wrong.

BUG=chromium-os:6030
TEST=out/Release/ui_tests --gtest_filter='OptionsUITest*'

Review URL: http://codereview.chromium.org/4109003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@64038 0039d316-1c4b-4281-b951-d872f2087c98

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