new TokenType and Keyword API

pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
index ee485ffe846bc698b47a46636b981fa7a9045f88..96cf40ba938e2a2b55d50eba9896935fa58951a5 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
@@ -182,11 +182,11 @@ class _KeywordVisitor extends GeneralizingAstVisitor {
           !node.directives.any((d) => d is LibraryDirective)) {
         _addSuggestions([Keyword.LIBRARY], DART_RELEVANCE_HIGH);
       }
-      _addSuggestion2('${Keyword.IMPORT.syntax} \'\';',
+      _addSuggestion2('${Keyword.IMPORT.lexeme} \'\';',
           offset: 8, relevance: DART_RELEVANCE_HIGH);
-      _addSuggestion2('${Keyword.EXPORT.syntax} \'\';',
+      _addSuggestion2('${Keyword.EXPORT.lexeme} \'\';',
           offset: 8, relevance: DART_RELEVANCE_HIGH);
-      _addSuggestion2('${Keyword.PART.syntax} \'\';',
+      _addSuggestion2('${Keyword.PART.lexeme} \'\';',
           offset: 6, relevance: DART_RELEVANCE_HIGH);
     }
     if (entity == null || entity is Declaration) {
@@ -561,7 +561,7 @@ class _KeywordVisitor extends GeneralizingAstVisitor {
 
   void _addSuggestion(Keyword keyword,
       [int relevance = DART_RELEVANCE_KEYWORD]) {
-    _addSuggestion2(keyword.syntax, relevance: relevance);
+    _addSuggestion2(keyword.lexeme, relevance: relevance);
   }
 
   void _addSuggestion2(String completion,