Remove use of package:analyzer in dependency_grapher

pkg/front_end/test/subpackage_relationships_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';
 import 'dart:io';
 
 import 'package:front_end/compiler_options.dart';
 import 'package:front_end/dependency_grapher.dart';
 import 'package:path/path.dart' as pathos;
 
 main() async {
   exit(await new _SubpackageRelationshipsTest().run());
 }
 
 /// Map from subpackage name to the rules for what the subpackage is allowed to
 /// depend directly on.
 ///
 /// Each listed directory is considered a subpackage.  Each package contains all
 /// of its descendant files that are not in a more deeply nested subpackage.
 ///
 /// TODO(paulberry): stuff in lib/src shouldn't depend on lib; lib should just
 /// re-export stuff in lib/src.
 /// TODO(paulberry): remove dependencies on analyzer.
 final subpackageRules = {
   'lib': new SubpackageRules(
       mayImportAnalyzer: true,
       allowedDependencies: ['lib/src', 'lib/src/base']),
-  'lib/src': new SubpackageRules(
-      mayImportAnalyzer: true,
-      allowedDependencies: ['lib', 'lib/src/base', 'lib/src/scanner']),
+  'lib/src': new SubpackageRules(mayImportAnalyzer: true, allowedDependencies: [
+    'lib',
+    'lib/src/base',
+    'lib/src/fasta',
+    'lib/src/fasta/source',
+  ]),
   'lib/src/base': new SubpackageRules(
       mayImportAnalyzer: true, allowedDependencies: ['lib']),
   'lib/src/codegen': new SubpackageRules(),
   'lib/src/fasta':
       new SubpackageRules(mayImportAnalyzer: false, allowedDependencies: [
     'lib/src/fasta/builder',
     'lib/src/fasta/dill',
     'lib/src/fasta/kernel',
     'lib/src/fasta/parser',
     'lib/src/fasta/scanner',
@@ skipping 231 matching lines @@
       if (subpackageRules[subpackage].allowSubdirs) {
         subpackageRules[subpackage].actuallyHasSubdirs = true;
       } else {
         problem('Uri $src is in a subfolder of $subpackage, but that '
             'subpackage does not allow dart files in subdirectories.');
       }
     }
     return subpackage;
   }
 }