All strong mode cleaning of dart2js.

tests/compiler/dart2js/exit_code_test.dart

 // Copyright (c) 2013, 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.
 
 // Test the exit code of dart2js in case of exceptions, errors, warnings, etc.
 
 import 'dart:async';
 import 'dart:io' show Platform;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 
 import 'package:compiler/compiler_new.dart' as api;
 import 'package:compiler/src/common/codegen.dart';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/compile_time_constants.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/dart2js.dart' as entry;
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 import 'package:compiler/src/diagnostics/invariant.dart';
 import 'package:compiler/src/diagnostics/messages.dart';
 import 'package:compiler/src/diagnostics/spannable.dart';
 import 'package:compiler/src/apiimpl.dart' as apiimpl;
 import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/js_backend/js_backend.dart';
 import 'package:compiler/src/library_loader.dart';
 import 'package:compiler/src/null_compiler_output.dart';
 import 'package:compiler/src/options.dart' show CompilerOptions;
 import 'package:compiler/src/resolution/resolution.dart';
 import 'package:compiler/src/scanner/scanner_task.dart';
 import 'package:compiler/src/universe/world_impact.dart';
 import 'package:compiler/src/world.dart';
 import 'diagnostic_reporter_helper.dart';
 
@@ skipping 96 matching lines @@
     compiler.test('Compiler.codegen');
     return super.codegen(work, closedWorld);
   }
 }
 
 class TestDiagnosticReporter extends DiagnosticReporterWrapper {
   TestCompiler compiler;
   DiagnosticReporter reporter;
 
   @override
-  withCurrentElement(Element element, f()) {
+  withCurrentElement(Entity element, f()) {
     return super.withCurrentElement(element, () {
       compiler.test('Compiler.withCurrentElement');
       return f();
     });
   }
 }
 
 class TestScanner extends ScannerTask {
   final TestCompiler compiler;
 
@@ skipping 155 matching lines @@
 
       expected =
           _expectedExitCode(beforeRun: tests[marker], fatalWarnings: true);
       totalExpectedErrors += expected.length;
       await testExitCodes(marker, expected, ['--fatal-warnings']);
     }
 
     Expect.equals(totalExpectedErrors, checkedResults);
   });
 }