Use packages dart_parser, dart_scanner, and compiler_util.

pkg/compiler/lib/src/tokens/precedence.dart

Index: pkg/compiler/lib/src/tokens/precedence.dart
diff --git a/pkg/compiler/lib/src/tokens/precedence.dart b/pkg/compiler/lib/src/tokens/precedence.dart
deleted file mode 100644
index c3f4906c9299b6389c015bc0f05ecb436833b202..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/tokens/precedence.dart
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2015, 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 dart2js.tokens.precedence;
-
-import '../util/util.dart' show computeHashCode;
-
-class PrecedenceInfo {
-  final String value;
-  final int precedence;
-  final int kind;
-
-  const PrecedenceInfo(this.value, this.precedence, this.kind);
-
-  toString() => 'PrecedenceInfo($value, $precedence, $kind)';
-
-  int get hashCode => computeHashCode(value, precedence, kind);
-}