Remove the checker and corresponding dead code

test/codegen_test.dart

 // Copyright (c) 2015, 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.
 
 /// Tests code generation.
 /// Runs Dart Dev Compiler on all input in the `codegen` directory and checks
 /// that the output is what we expected.
 library dev_compiler.test.codegen_test;
 
 import 'dart:io';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine, Logger;
 import 'package:analyzer/src/generated/java_engine.dart' show CaughtException;
 import 'package:args/args.dart';
 import 'package:logging/logging.dart' show Level;
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
 
 import 'package:dev_compiler/devc.dart';
-import 'package:dev_compiler/strong_mode.dart';
 import 'package:dev_compiler/src/compiler.dart' show defaultRuntimeFiles;
 import 'package:dev_compiler/src/options.dart';
 
 import 'testing.dart' show realSdkContext, testDirectory;
 import 'multitest.dart';
 
 final ArgParser argParser = new ArgParser()
   ..addOption('dart-sdk', help: 'Dart SDK Path', defaultsTo: null);
 
 final inputDir = path.join(testDirectory, 'codegen');
@@ skipping 146 matching lines @@
       setUp(() {
         savedLogger = AnalysisEngine.instance.logger;
         AnalysisEngine.instance.logger = new PrintLogger();
       });
       tearDown(() {
         AnalysisEngine.instance.logger = savedLogger;
       });
 
       test('devc dart:core', () {
         var testSdkContext = createAnalysisContextWithSources(
-            new StrongModeOptions(),
             new SourceResolverOptions(
                 dartSdkPath:
                     path.join(testDirectory, '..', 'tool', 'generated_sdk')));
 
         // Get the test SDK. We use a checked in copy so test expectations can
         // be generated against a specific SDK version.
         var compiler = createCompiler(testSdkContext, checkSdk: true);
         compile(compiler, 'dart:core');
         var outFile = new File(path.join(expectDir, 'dart/core.js'));
         expect(outFile.existsSync(), true,
@@ skipping 45 matching lines @@
     print('[AnalysisEngine] error $message $exception');
   }
 
   @override void logError2(String message, Object exception) {
     print('[AnalysisEngine] error $message $exception');
   }
 
   void logInformation(String message, [CaughtException exception]) {}
   void logInformation2(String message, Object exception) {}
 }