Improve the icon theme detection on Gnome; Improve icon theme heuristics for KDE. Don't let Gnome use default KDE icons themes and vice versa.
Improve the icon theme detection on Gnome; Improve icon theme heuristics for KDE. Don't let Gnome use default KDE icons themes and vice versa.

BUG=13001
TEST=Download some files, make sure file icons in the download manager match / closely resemble those in Nautalus / Konqueror.
Review URL: http://codereview.chromium.org/119113

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@17558 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