remove dependencies to analyzer from lib/src/fasta

pkg/front_end/test/fasta/bootstrap_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async' show Future;
 
 import 'dart:io' show Directory, File, Platform;
 
 import 'dart:isolate' show Isolate;
 
 import 'package:async_helper/async_helper.dart' show asyncEnd, asyncStart;
 
-import 'package:front_end/src/fasta/testing/kernel_chain.dart'
+import 'package:front_end/src/fasta/patched_sdk_location.dart'
     show computePatchedSdk;
 
 import 'package:testing/testing.dart' show StdioProcess;
 
 import 'package:kernel/binary/ast_from_binary.dart' show BinaryBuilder;
 
 import 'package:kernel/ast.dart' show Program;
 
 import 'package:kernel/text/ast_to_text.dart' show programToString;
 
@@ skipping 82 matching lines @@
 }
 
 class ComparisonFailed {
   final Uri a;
   final Uri b;
 
   ComparisonFailed(this.a, this.b);
 
   toString() => "Error: $a is different from $b";
 }