Add style check, test, and code fixes for an else brace check.

components/script/dom/htmlmediaelement.rs

@@ -133,9 +133,8 @@ impl AsyncResponseListener for HTMLMediaElementContext {
 
             // Step 5
             elem.fire_simple_event("error");
-        }
-        // => "If the media data cannot be fetched at all..."
-        else {
+        } else {
+            // => "If the media data cannot be fetched at all..."
             elem.queue_dedicated_media_source_failure_steps();
         }
 

components/script/dom/xmlhttprequest.rs

@@ -1128,9 +1128,8 @@ impl XMLHttpRequest {
                 // Step 5
                 if self.response_type.get() == XMLHttpRequestResponseType::_empty {
                     return None;
-                }
-                // Step 6
-                else {
+                } else {
+                    // Step 6
                     temp_doc = self.document_text_html();
                 }
             },
@@ -1143,8 +1142,7 @@ impl XMLHttpRequest {
             Some(Mime(_, mime::SubLevel::Ext(sub), _)) => {
                 if sub.ends_with("+xml") {
                     temp_doc = self.handle_xml();
-                }
-                else {
+                } else {
                     return None;
                 }
             },

components/script/webdriver_handlers.rs

@@ -374,8 +374,7 @@ pub fn handle_is_selected(context: &BrowsingContext,
             }
             else if let Some(_) = node.downcast::<HTMLElement>() {
                 Ok(false) // regular elements are not selectable
-            }
-            else {
+            } else {
                 Err(())
             }
         },