Refactor CompilerOutput

pkg/compiler/lib/src/dart2js.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.
 
 library dart2js.cmdline;
 
 import 'dart:async' show EventSink, Future;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io' show exit, File, FileMode, Platform, stdin, stderr;
 
@@ skipping 985 matching lines @@
 
 class _SerializedData {
   final Uri uri;
   final String data;
 
   _SerializedData(this.uri, this.data);
 }
 
 class _CompilerOutput extends NullCompilerOutput {
   final Uri uri;
-  _BufferedEventSink sink;
+  _BufferedOutputSink sink;
 
   _CompilerOutput(this.uri);
 
   @override
-  EventSink<String> createEventSink(String name, String extension) {
+  api.OutputSink createOutputSink(
+      String name, String extension, api.OutputType type) {
     if (name == '' && extension == 'data') {
-      return sink = new _BufferedEventSink();
+      return sink = new _BufferedOutputSink();
     }
-    return super.createEventSink(name, extension);
+    return super.createOutputSink(name, extension, type);
   }
 
   _SerializedData get serializedData {
     return new _SerializedData(uri, sink.sb.toString());
   }
 }
 
-class _BufferedEventSink implements EventSink<String> {
+class _BufferedOutputSink implements api.OutputSink {
   StringBuffer sb = new StringBuffer();
 
   @override
   void add(String event) {
     sb.write(event);
   }
 
   @override
   void close() {
     // Do nothing.
   }
-
-  @override
-  void addError(errorEvent, [StackTrace stackTrace]) {
-    // Ignore
-  }
 }