More reliably find the .desktop file for the browser.
More reliably find the .desktop file for the browser.

Also search in "applications" subdirectory of each of XDG_DATA_DIRS.

TEST=See bug.
BUG=21995

Review URL: http://codereview.chromium.org/214010

git-svn-id: http://src.chromium.org/svn/trunk/src@26590 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c885ebcbf6135ed44b4f796254c447efd7f24f90
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