Remove unintentional dependency on analysis_server

pkg/analysis_server/lib/src/services/correction/util.dart

 // Copyright (c) 2014, 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 services.src.correction.util;
-
 import 'dart:math';
 
 import 'package:analysis_server/protocol/protocol_generated.dart'
     show SourceChange, SourceEdit;
 import 'package:analysis_server/src/protocol_server.dart'
     show doSourceChange_addElementEdit;
 import 'package:analysis_server/src/services/correction/strings.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer_plugin/src/utilities/string_utilities.dart';
 import 'package:analyzer_plugin/utilities/range_factory.dart';
 import 'package:path/path.dart';
 
 /**
  * Adds edits to the given [change] that ensure that all the [libraries] are
  * imported into the given [targetLibrary].
  */
 void addLibraryImports(
     SourceChange change, LibraryElement targetLibrary, Set<Source> libraries) {
   CorrectionUtils libUtils;
@@ skipping 1612 matching lines @@
       _InvertedCondition expr, int newOperatorPrecedence) {
     if (expr._precedence < newOperatorPrecedence) {
       return "(${expr._source})";
     }
     return expr._source;
   }
 
   static _InvertedCondition _simple(String source) =>
       new _InvertedCondition(2147483647, source);
 }