Fix infinite loop in grit headers clobbering script.
Fix infinite loop in grit headers clobbering script.

It turns out that on Windows the path-splitting function will always preserve the drive part (c:\).

TEST=none
http://crbug.com/17706

Review URL: http://codereview.chromium.org/159827

git-svn-id: http://src.chromium.org/svn/trunk/src@22344 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: bf55f6c1059f29f77f20291ceb8dd87fde462caf
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