analyzer_exp fixes

pkg/analyzer_experimental/lib/src/analyzer_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.
 
 library analyzer_impl;
 
-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';
 
 
 DartSdk sdk;
 
 /// Analyzes single library [File].
 class AnalyzerImpl {
   final CommandLineOptions options;
 
@@ skipping 128 matching lines @@
       JavaFile packagesDir = new JavaFile.relative(dir, "packages");
       if (packagesDir.exists()) {
         return packagesDir;
       }
       dir = dir.getParentFile();
     }
     // not found
     return null;
   }
 }