Remove some deprecated file_util wstring functions.

death to the wstring

TEST=trybots
BUG=none

Review URL: http://codereview.chromium.org/276016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@29078 0039d316-1c4b-4281-b951-d872f2087c98
34 files changed