wstring: remove needless use of conversions from Chrome Frame
wstring: remove needless use of conversions from Chrome Frame

BUG=76112

Review URL: http://codereview.chromium.org/6673026

git-svn-id: http://src.chromium.org/svn/trunk/src@78255 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 59016deb059185c96081adb3903532291690a208
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser