Add fixes based on review.

- Use if let instead of match for Option

- Refactor common code into pick_if_selected_and_reset

components/script/dom/htmloptionelement.rs

@@ -56,6 +56,17 @@ impl HTMLOptionElement {
     pub fn set_selectedness(&self, selected: bool) {
         self.selectedness.set(selected);
     }
+
+    fn pick_if_selected_and_reset(&self) {
+        if let Some(select) = self.upcast::<Node>().ancestors()
+                .filter_map(Root::downcast::<HTMLSelectElement>)
+                .next() {
+            if self.Selected() {
+                select.pick_option(self);
+            }
+            select.ask_for_reset();
+        }
+    }
 }
 
 fn collect_text(element: &Element, value: &mut DOMString) {
@@ -139,13 +150,7 @@ impl HTMLOptionElementMethods for HTMLOptionElement {
     fn SetSelected(&self, selected: bool) {
         self.dirtiness.set(true);
         self.selectedness.set(selected);
-        if let Some(select) = self.upcast::<Node>().ancestors()
-                .filter_map(Root::downcast::<HTMLSelectElement>).next() {
-            if selected {
-                select.pick_option(self);
-            }
-            select.ask_for_reset();
-        }
+        self.pick_if_selected_and_reset();
     }
 }
 
@@ -198,14 +203,7 @@ impl VirtualMethods for HTMLOptionElement {
 
         self.upcast::<Element>().check_parent_disabled_state_for_option();
 
-        if let Some(select) = self.upcast::<Node>().ancestors()
-                .filter_map(Root::downcast::<HTMLSelectElement>)
-                .next() {
-            if self.Selected() {
-                select.pick_option(self);
-            }
-            select.ask_for_reset();
-        }
+        self.pick_if_selected_and_reset();
     }
 
     fn unbind_from_tree(&self, tree_in_doc: bool) {

components/script/dom/htmlselectelement.rs

@@ -70,13 +70,12 @@ impl HTMLSelectElement {
             }
         }
 
-        match last_selected {
-            Some(last_selected) => last_selected.set_selectedness(true),
-            None => {
-                if self.display_size() == 1 {
-                    if let Some(first_enabled) = first_enabled {
-                        first_enabled.set_selectedness(true);
-                    }
+        if let Some(last_selected) = last_selected {
+            last_selected.set_selectedness(true);
+        } else {
+            if self.display_size() == 1 {
+                if let Some(first_enabled) = first_enabled {
+                    first_enabled.set_selectedness(true);
                 }
             }
         }