Coverity issue 7892: Bad override (in unit test).
Coverity issue 7892: Bad override (in unit test).

Function override signature doesn't match the one in its base class.

BUG=None
TEST=Fixing a unit test.

Review URL: http://codereview.chromium.org/3015017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@53338 0039d316-1c4b-4281-b951-d872f2087c98

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