Fix re2 dependency path.

BUG=336531,335760
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/138593005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246134 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246134