Make analyzer strong-mode clean

pkg/analyzer/test/src/summary/summarize_ast_test.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.
 
 library analyzer.test.src.summary.summarize_ast_test;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 357 matching lines @@
   PackageBundleBuilder createPackageBundle(String text,
       {String path: '/test.dart'}) {
     PackageBundleAssembler assembler = new PackageBundleAssembler();
     LinkerInputs linkerInputs = createLinkerInputs(text, path: path);
     Map<String, LinkedLibraryBuilder> linkedLibraries = link(
         linkerInputs.linkedLibraries,
         linkerInputs.getDependency,
         linkerInputs.getUnit,
         true);
     linkedLibraries.forEach(assembler.addLinkedLibrary);
-    linkerInputs._uriToUnit.forEach((String uri, UnlinkedUnitBuilder unit) {
+    linkerInputs._uriToUnit.forEach((String uri, UnlinkedUnit unit) {
       // Note: it doesn't matter what we store for the hash because it isn't
       // used in these tests.
       assembler.addUnlinkedUnitWithHash(uri, unit, 'HASH');
     });
     return assembler.assemble();
   }
 
   CompilationUnit _parseText(String text) {
     CharSequenceReader reader = new CharSequenceReader(text);
     Scanner scanner =
         new Scanner(null, reader, AnalysisErrorListener.NULL_LISTENER);
     Token token = scanner.tokenize();
     Parser parser = new Parser(null, AnalysisErrorListener.NULL_LISTENER);
     parser.parseGenericMethods = true;
     return parser.parseCompilationUnit(token);
   }
 }