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These were only used by one test file, so I moved the implementation there. I
considered updating the test, but the way the test uses wstrings seems
reasonable.

R=rvargas@chromium.org, rvargas

Review URL: https://codereview.chromium.org/448763003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288084 0039d316-1c4b-4281-b951-d872f2087c98