Doing some cleanup.

src/tests/site/code/Switcher.dart

 // XXX: This file isn't used right now
 
 import 'dart:html';
 
 final List<String> osList = const <String>['macos', 'windows', 'linux'];  // all supported OSs
 String osName = 'linux'; // the currently displayed platform
 
 /** Initializes osName and selects the corresponding radio button. */
 void detectPlatform() {
   // osName is initially 'linux', since linux strings are unpredictable.
@@ skipping 25 matching lines @@
     });
   });
 }
 
 /** Ready, set, go! */
 void main() {
   detectPlatform();
   filterPlatformText();
   registerHandlers();
 }