Move scanner out of generated and clean up imports

pkg/analyzer/lib/src/generated/utilities_collection.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 analyzer.src.generated.utilities_collection;
 
 import 'dart:collection';
 import "dart:math" as math;
 
+import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/src/generated/java_core.dart';
-import 'package:analyzer/src/generated/scanner.dart' show Token;
 
 /**
  * Returns `true` if a and b contain equal elements in the same order.
  */
 bool listsEqual(List a, List b) {
   // TODO(rnystrom): package:collection also implements this, and analyzer
   // already transitively depends on that package. Consider using it instead.
   if (identical(a, b)) {
     return true;
   }
@@ skipping 716 matching lines @@
   /**
    * Map the key to the value.
    *
    * @param key the token being mapped to the value
    * @param value the token to which the key will be mapped
    */
   void put(Token key, Token value) {
     _map[key] = value;
   }
 }