flatten Keyword into TokenType

pkg/analyzer/lib/src/dart/element/element.dart

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 17a7e99ec39819f3e80201c113cbb58f792e40fc..a22e9bb6f08c0413fe692e249ce20622cb2aa803 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -2426,7 +2426,7 @@ class DynamicElementImpl extends ElementImpl implements TypeDefiningElement {
    * with this element. The single instance of this class should be accessed
    * through the method [instance].
    */
-  DynamicElementImpl() : super(Keyword.DYNAMIC.syntax, -1) {
+  DynamicElementImpl() : super(Keyword.DYNAMIC.lexeme, -1) {
     setModifier(Modifier.SYNTHETIC, true);
   }