analyzer_exp fixes

pkg/analyzer_experimental/lib/src/services/runtime/coverage/coverage_impl.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.
 
 /// A library for code coverage support for Dart.
 library runtime.coverage.impl;
 
 import 'dart:async';
 import 'dart:collection' show SplayTreeMap;
 import 'dart:io';
-import 'dart:json' as json;
 
 import 'package:path/path.dart' as pathos;
 
-import 'package:analyzer_experimental/src/generated/source.dart' show Source, SourceRange;
 import 'package:analyzer_experimental/src/generated/scanner.dart' show StringScanner;
 import 'package:analyzer_experimental/src/generated/parser.dart' show Parser;
 import 'package:analyzer_experimental/src/generated/ast.dart';
 import 'package:analyzer_experimental/src/generated/engine.dart' show RecordingErrorListener;
 
 import '../log.dart' as log;
 import 'models.dart';
-import 'utils.dart';
 
 /// Run the [targetPath] with code coverage rewriting.
 /// Redirects stdandard process streams.
 /// On process exit dumps coverage statistics into the [outPath].
 void runServerApplication(String targetPath, String outPath) {
   var targetFolder = pathos.dirname(targetPath);
   var targetName = pathos.basename(targetPath);
   var server = new CoverageServer(targetFolder, targetPath, outPath);
   server.start().then((port) {
     var options = new Options();
@@ skipping 299 matching lines @@
     var lastOffset = 0;
     offsetFragmentMap.forEach((offset, fragment) {
       sb.write(_code.substring(lastOffset, offset));
       sb.write(fragment);
       lastOffset = offset;
     });
     sb.write(_code.substring(lastOffset, _code.length));
     return sb.toString();
   }
 }