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

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

Index: pkg/analyzer-experimental/lib/src/generated/engine.dart
diff --git a/pkg/analyzer-experimental/lib/src/generated/engine.dart b/pkg/analyzer-experimental/lib/src/generated/engine.dart
index 20ab9248d6939c4605b24706f55b861030ec9451..b1f1265dbb0984d2e0524063b44b29e5ed4ab2d0 100644
--- a/pkg/analyzer-experimental/lib/src/generated/engine.dart
+++ b/pkg/analyzer-experimental/lib/src/generated/engine.dart
@@ -513,7 +513,7 @@ class AnalysisContextImpl implements AnalysisContext {
   }
   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);
@@ -657,4 +657,4 @@ class Logger_NullLogger implements Logger {
   }
   void logInformation2(String message, Exception exception) {
   }
-}
+}