remove dependencies to analyzer from lib/src/fasta

pkg/front_end/lib/src/fasta/kernel/kernel_target.dart

 // Copyright (c) 2016, 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 fasta.kernel_target;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File, IOSink;
 
@@ skipping 32 matching lines @@
 
 import 'package:kernel/text/ast_to_text.dart' show Printer;
 
 import 'package:kernel/transformations/erasure.dart' show Erasure;
 
 import 'package:kernel/transformations/continuation.dart' as transformAsync;
 
 import 'package:kernel/transformations/mixin_full_resolution.dart'
     show MixinFullResolution;
 
-import 'package:kernel/transformations/continuation.dart' as continuation;
-
 import 'package:kernel/transformations/setup_builtin_library.dart'
     as setup_builtin_library;
 
 import 'package:kernel/type_algebra.dart' show substitute;
 
 import '../source/source_loader.dart' show SourceLoader;
 
 import '../source/source_class_builder.dart' show SourceClassBuilder;
 
 import '../target_implementation.dart' show TargetImplementation;
@@ skipping 654 matching lines @@
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0
           ? constructor
           : null;
     }
   }
   return null;
 }