Fix a regression in ChromeFrame which would cause the headers like the UA to be appended twice.
Fix a regression in ChromeFrame which would cause the headers like the UA to be appended
twice.

Bug=none

Review URL: http://codereview.chromium.org/4249001

git-svn-id: http://src.chromium.org/svn/trunk/src@64694 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f9d0e9acb744dee07fdc35c89d5d9a573db15b9c
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