Display only the sandboxed portion of the URL when listing a filesystem: URL that refers to a directory.
Display only the sandboxed portion of the URL when listing
a filesystem: URL that refers to a directory.

This avoids leaking implementation details of the sandboxed filesystem.

Review URL: http://codereview.chromium.org/6537011

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@75329 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser