Adds support for remaining generic method syntax constructs.

pkg/compiler/lib/src/scanner/array_based_scanner.dart

Index: pkg/compiler/lib/src/scanner/array_based_scanner.dart
diff --git a/pkg/compiler/lib/src/scanner/array_based_scanner.dart b/pkg/compiler/lib/src/scanner/array_based_scanner.dart
index 27540a48b03b5f47111fe608eea63c932eddfa5c..2496daa3d0d035471370e45d65e1bb0d1ba29c91 100644
--- a/pkg/compiler/lib/src/scanner/array_based_scanner.dart
+++ b/pkg/compiler/lib/src/scanner/array_based_scanner.dart
@@ -63,8 +63,8 @@ abstract class ArrayBasedScanner extends AbstractScanner {
    */
   void appendKeywordToken(Keyword keyword) {
     String syntax = keyword.syntax;
-    // Type parameters and arguments cannot contain 'this' or 'super'.
-    if (identical(syntax, 'this') || identical(syntax, 'super')) {
+    // Type parameters and arguments cannot contain 'this'.
+    if (identical(syntax, 'this')) {
       discardOpenLt();
     }
     tail.next = new KeywordToken(keyword, tokenStart);