Refactor CompilerOutput

tests/compiler/dart2js/number_output_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.
 
 import 'dart:async';
 import 'package:expect/expect.dart';
+import 'package:compiler/compiler_new.dart';
 import 'package:async_helper/async_helper.dart';
 import 'memory_compiler.dart';
 
 const MEMORY_SOURCE_FILES = const {
   'main.dart': '''
         main() {
           print(12300000);
           print(1234567890123456789012345);
           print(double.MAX_FINITE);
           print(-22230000);
         }'''
 };
 
 Future test({bool minify}) async {
   OutputCollector collector = new OutputCollector();
   await runCompiler(
       memorySourceFiles: MEMORY_SOURCE_FILES,
       outputProvider: collector,
       options: minify ? ['--minify'] : []);
 
   // Check that we use the shorter exponential representations.
-  String jsOutput = collector.getOutput('', 'js');
+  String jsOutput = collector.getOutput('', OutputType.js);
   print(jsOutput);
 
   if (minify) {
     Expect.isTrue(jsOutput.contains('123e5')); // Shorter than 12300000.
     Expect.isFalse(jsOutput.contains('12300000'));
     Expect.isTrue(jsOutput.contains('-2223e4')); // Shorter than -22230000.
     Expect.isFalse(jsOutput.contains('-22230000'));
   } else {
     Expect.isTrue(jsOutput.contains('12300000'));
     Expect.isTrue(jsOutput.contains('-22230000'));
   }
   Expect.isTrue(jsOutput.contains('12345678901234568e8'));
   Expect.isTrue(jsOutput.contains('17976931348623157e292'));
   Expect.isFalse(jsOutput.contains('1234567890123456789012345'));
   // The decimal expansion of double.MAX_FINITE has 308 digits. We only check
   // for its prefix.
   Expect.isFalse(jsOutput.contains('179769313486231570814527423731'));
 }
 
 main() {
   asyncTest(() async {
     await test(minify: true);
     await test(minify: false);
   });
 }