Rename regexp methods to getters.

lib/compiler/implementation/dart2js.dart

Index: lib/compiler/implementation/dart2js.dart
diff --git a/lib/compiler/implementation/dart2js.dart b/lib/compiler/implementation/dart2js.dart
index f94c219a878aab8700b11963ad520774b542b254..eafb1e6a914f8e9d08c9f45dd3814d44ac6bb9c6 100644
--- a/lib/compiler/implementation/dart2js.dart
+++ b/lib/compiler/implementation/dart2js.dart
@@ -54,7 +54,7 @@ void parseCommandLine(List<OptionHandler> handlers, List<String> argv) {
   var pattern = new RegExp('^(${Strings.join(patterns, ")\$|(")})\$');
   OUTER: for (String argument in argv) {
     Match match = pattern.firstMatch(argument);
-    assert(match.groupCount() == handlers.length);
+    assert(match.groupCount == handlers.length);
     for (int i = 0; i < handlers.length; i++) {
       if (match[i + 1] != null) {
         handlers[i].handle(argument);