Chrome 28 creates .desktop files with a broken Exec line,
which makes them completely useless.

Also remove workaround for missing newline character, it
has been fixed upstream and we no longer need it, see
https://code.google.com/p/chromium/issues/detail?id=169660

Change-Id: I4155c641dd3b10b334fd713704e53f86853a417e
Signed-off-by: Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>
Bug: https://code.google.com/p/chromium/issues/detail?id=247574