Revert "Adding supported checks for Element.matches."

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index c492b123cb243d3be49c7e41d8805010b4d22498..a1deb0833fc8217b96c3cac476d29768fd19c842 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -9435,14 +9435,6 @@ abstract class Element extends Node implements ElementTraversal {
    */
   var xtag;
 
-  /**
-   * Checks if the matches function is supported on the current platform.
-   *
-   * See also:
-   *
-   * * [matches]
-   */
-  static bool get supportsMatches => true;
 
   Element.internal() : super.internal();
 
@@ -9897,10 +9889,6 @@ abstract class Element extends Node implements ElementTraversal {
 
   @DomName('Element.webkitMatchesSelector')
   @DocsEditable
-  @SupportedBrowser(SupportedBrowser.CHROME)
-  @SupportedBrowser(SupportedBrowser.FIREFOX)
-  @SupportedBrowser(SupportedBrowser.IE, '10')
-  @SupportedBrowser(SupportedBrowser.SAFARI)
   bool matches(String selectors) native "Element_webkitMatchesSelector_Callback";
 
   @DomName('Element.webkitRequestFullScreen')