Move dromaeo to third_party

samples/third_party/dromaeo/tests/dom-query.dart

 #library("dom-query.dart");
 #import("dart:dom");
-#import('../../common/common.dart');
+#import('../common/common.dart');
 #import('runner.dart');
 
 void main() {
   final int num = 40;
 
   // Try to force real results.
   var ret;
 
   String html = document.body.innerHTML;
 
@@ skipping 79 matching lines @@
       for (int i = 0; i < num * 20; i++) {
         ret = document.getElementsByName('test').length == 0;
         ret = document.getElementsByName('test').length == 0;
         ret = document.getElementsByName('test').length == 0;
         ret = document.getElementsByName('test').length == 0;
         ret = document.getElementsByName('test').length == 0;
       }
     })
     .end();
 }