Fix warnings

src/Application.vala

@@ -19,29 +19,13 @@
 * Authored by: Felipe Escoto <[email protected]>
 */
 
-public class Wallpaperize.Application : Granite.Application {
-    public const string PROGRAM_ID = "com.github.philip-scott.wallpaperize";
+public class Wallpaperize.Application : Gtk.Application {
     public const string PROGRAM_NAME = "Wallpaperize";
 
     construct {
         flags |= ApplicationFlags.HANDLES_OPEN;
 
-        application_id = PROGRAM_ID;
-        program_name = PROGRAM_NAME;
-        app_years = "2016-2017";
-        exec_name = PROGRAM_ID;
-        app_launcher = PROGRAM_ID;
-
-        build_version = "1.0";
-        app_icon = PROGRAM_ID;
-        main_url = "https://github.com/Philip-Scott/%s/".printf (PROGRAM_NAME);
-        bug_url = "https://github.com/Philip-Scott/%s/issues".printf (PROGRAM_NAME);
-        help_url = "https://github.com/Philip-Scott/%s/issues".printf (PROGRAM_NAME);
-        translate_url = "https://github.com/Philip-Scott/%s/tree/master/po".printf (PROGRAM_NAME);
-        about_authors = {"Felipe Escoto <[email protected]>", null};
-        about_translators = _("translator-credits");
-
-        about_license_type = Gtk.License.GPL_3_0;
+        application_id = "com.github.philip-scott.wallpaperize";
     }
 
     public override void open (File[] files, string hint) {

src/Wallpaperize.vala

@@ -23,14 +23,14 @@ public class Wallpaperize.Wallpaperiser : Object {
     }
 
     public static void get_monitor_geometry() {
-        var screen = Gdk.Screen.get_default ();
-        int primary_monitor = screen.get_primary_monitor ();
-        Gdk.Rectangle geometry;
-        screen.get_monitor_geometry (primary_monitor, out geometry);
-
-        int monitor_scale = screen.get_monitor_scale_factor (primary_monitor);
-        Wallpaperize.Wallpaperiser.H = geometry.height * monitor_scale;
-        Wallpaperize.Wallpaperiser.W = geometry.width * monitor_scale;
+        var display = Gdk.Display.get_default ();
+        Gdk.Monitor monitor = display.get_primary_monitor ();
+        Gdk.Rectangle geometry = monitor.get_geometry ();
+
+        int scale_factor = monitor.get_scale_factor ();
+
+        Wallpaperize.Wallpaperiser.H = geometry.height * scale_factor;
+        Wallpaperize.Wallpaperiser.W = geometry.width * scale_factor;
     }
 
     public static void make_image (string input, string output) {