package_config/GNOME: Install firefox instead of chromium

Firefox uses GTK and currently chromium is broken in SID.

Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
Change-Id: If2617ea79fa4c41f75995716a92b6e327a2294da
diff --git a/package_config/GNOME b/package_config/GNOME
index e1e4ac8..b14f5bf 100644
--- a/package_config/GNOME
+++ b/package_config/GNOME
@@ -2,9 +2,9 @@
 alsa-utils
 bc
 build-essential
-chromium
 evtest
 fbset
+firefox
 gdbserver
 git
 glmark2