Remove obsolete version of dromaeo

lib/html/benchmarks/dromaeo/Suites.dart

-class Origin {
-  final String author;
-  final String url;
-
-  const Origin(this.author, this.url);
-}
-
-class SuiteDescription {
-  final String file;
-  final String name;
-  final Origin origin;
-  final String description;
-
-  const SuiteDescription(this.file, this.name, this.origin, this.description);
-}
-
-class Suites {
-  static final JOHN_RESIG = const Origin('John Resig', 'http://ejohn.org/');
-
-  static final SUITE_DESCRIPTIONS = const [
-      const SuiteDescription(
-          'dom-attr.html',
-          'DOM Attributes',
-          JOHN_RESIG,
-          'Setting and getting DOM node attributes'),
-      const SuiteDescription(
-          'dom-modify.html',
-          'DOM Modification',
-          JOHN_RESIG,
-          'Creating and injecting DOM nodes into a document'),
-      const SuiteDescription(
-          'dom-query.html',
-          'DOM Query',
-          JOHN_RESIG,
-          'Querying DOM elements in a document'),
-      const SuiteDescription(
-          'dom-traverse.html',
-          'DOM Traversal',
-          JOHN_RESIG,
-          'Traversing a DOM structure')
-  ];
-}