analyzer_exp fixes

pkg/analyzer_experimental/lib/src/error_formatter.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 error_formatter;
 
-import 'dart:async';
-import 'dart:io';
-
-import 'generated/java_io.dart';
 import 'generated/engine.dart';
 import 'generated/error.dart';
 import 'generated/source_io.dart';
-import 'generated/sdk.dart';
-import 'generated/sdk_io.dart';
-import 'generated/ast.dart';
-import 'generated/element.dart';
 import '../options.dart';
 
 /**
  * Helper for formatting [AnalysisError]s.
  * The two format options are a user consumable format and a machine consumable format.
  */
 class ErrorFormatter {
   StringSink out;
   CommandLineOptions options;
 
@@ skipping 110 matching lines @@
   }
 
   static String pluralize(String word, int count) {
     if (count == 1) {
       return word;
     } else {
       return word + "s";
     }
   }
 }