Revert "Adding supported checks for Element.matches."

tools/dom/templates/html/impl/impl_Element.darttemplate

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index e0ccc6541c70adee6637ecd39dc0411eb08c5e5a..838b6ce1fcc490125f0229c96bd6bdbb45a7d58f 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -895,18 +895,7 @@ $if DART2JS
 
   /**
    * Checks if this element matches the CSS selectors.
-   *
-   * Use [supportsMatches] to check if this is supported on the current
-   * platform.
-   *
-   * See also:
-   *
-   * * [supportsMatches]
    */
-  @SupportedBrowser(SupportedBrowser.CHROME)
-  @SupportedBrowser(SupportedBrowser.FIREFOX)
-  @SupportedBrowser(SupportedBrowser.IE, '10')
-  @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental
   bool matches(String selectors) {
     if (JS('bool', '!!#.matches', this)) {
@@ -920,28 +909,7 @@ $if DART2JS
     }
     throw new UnsupportedError("Not supported on this platform");
   }
-
-  /**
-   * Checks if the matches function is supported on the current platform.
-   *
-   * See also:
-   *
-   * * [matches]
-   */
-  static bool get supportsMatches {
-    var e = new DivElement();
-    return JS('bool', '!!(#.matches || #.webkitMatchesSelector || '
-      '#.mozMatchesSelector || #.msMatchesSelector)', e, e, e, e);
-  }
 $else
-  /**
-   * Checks if the matches function is supported on the current platform.
-   *
-   * See also:
-   *
-   * * [matches]
-   */
-  static bool get supportsMatches => true;
 $endif
 
 $!MEMBERS