Fix assert constructor initializer tests.

pkg/analyzer/lib/src/dart/analysis/file_state.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 322 matching lines @@
   CompilationUnit parse(AnalysisErrorListener errorListener) {
     AnalysisOptions analysisOptions = _fsState._analysisOptions;
 
     CharSequenceReader reader = new CharSequenceReader(content);
     Scanner scanner = new Scanner(source, reader, errorListener);
     scanner.scanGenericMethodComments = analysisOptions.strongMode;
     Token token = scanner.tokenize();
     LineInfo lineInfo = new LineInfo(scanner.lineStarts);
 
     Parser parser = new Parser(source, errorListener);
+    parser.enableAssertInitializer = analysisOptions.enableAssertInitializer;
     parser.parseGenericMethodComments = analysisOptions.strongMode;
     CompilationUnit unit = parser.parseCompilationUnit(token);
     unit.lineInfo = lineInfo;
     return unit;
   }
 
   /**
    * Read the file content and ensure that all of the file properties are
    * consistent with the read content, including API signature.
    *
@@ skipping 341 matching lines @@
         .where((f) => f._transitiveFiles == null)
         .toSet();
   }
 
   Set<FileState> get filesWithoutTransitiveSignature {
     return state._uriToFile.values
         .where((f) => f._transitiveSignature == null)
         .toSet();
   }
 }