Change new List(n) to return fixed length list.

pkg/analyzer-experimental/lib/src/generated/engine.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import 'java_core.dart';
 import 'dart:collection' show HasNextIterator;
 import 'error.dart';
 import 'source.dart';
 import 'scanner.dart' show Token, CharBufferScanner, StringScanner;
@@ skipping 495 matching lines @@
    * @param elementMap a table mapping the source for the libraries represented by the elements to
    * the elements representing the libraries
    */
   void recordLibraryElements(Map<Source, LibraryElement> elementMap) {
     {
       javaMapPutAll(_libraryElementCache, elementMap);
     }
   }
   CompilationUnit resolve(Source source, LibraryElement library) => parse(source);
   Token scan(Source source, AnalysisErrorListener errorListener) {
-    List<Token> tokens = new List<Token>.fixedLength(1);
+    List<Token> tokens = new List<Token>(1);
     Source_ContentReceiver receiver = new Source_ContentReceiver_1(source, errorListener, tokens);
     try {
       source.getContents(receiver);
     } on JavaException catch (exception) {
     }
     return tokens[0];
   }
   void set sourceFactory(SourceFactory sourceFactory2) {
     this._sourceFactory = sourceFactory2;
   }
@@ skipping 123 matching lines @@
   void logError(String message) {
   }
   void logError2(String message, Exception exception) {
   }
   void logError3(Exception exception) {
   }
   void logInformation(String message) {
   }
   void logInformation2(String message, Exception exception) {
   }
-}
+}