Mac: Fix ODR violation for ExpandPathVariables().

Introduced in http://codereview.chromium.org/6469081

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7495046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@94287 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed