style: Expose stylist::set_device() for gecko

MozReview-Commit-ID: L655tvOwyKH

components/style/gecko/generated/bindings.rs

@@ -1982,6 +1982,11 @@ extern "C" {
                                                 viewport_units_used:
                                                     *mut bool) -> u8;
 }
+extern "C" {
+    pub fn Servo_StyleSet_SetDevice(set: RawServoStyleSetBorrowed,
+                                    pres_context: RawGeckoPresContextOwned)
+     -> u8;
+}
 extern "C" {
     pub fn Servo_StyleSet_CompatModeChanged(raw_data:
                                                 RawServoStyleSetBorrowed);