Move assets into lib/src.

lib/src/utils.dart

 // Copyright (c) 2012, 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.
 
 /// Generic utility functions. Stuff that should possibly be in core.
 library pub.utils;
 
 import 'dart:async';
 import "dart:convert";
 import 'dart:io';
 
 import "package:crypto/crypto.dart";
 import 'package:path/path.dart' as path;
 import "package:stack_trace/stack_trace.dart";
 
 import 'exceptions.dart';
 import 'io.dart';
 import 'log.dart' as log;
 
-export '../../asset/dart/utils.dart';
+export 'asset/dart/utils.dart';
 
 /// A regular expression matching a Dart identifier.
 ///
 /// This also matches a package name, since they must be Dart identifiers.
 final identifierRegExp = new RegExp(r"[a-zA-Z_][a-zA-Z0-9_]+");
 
 /// Like [identifierRegExp], but anchored so that it only matches strings that
 /// are *just* Dart identifiers.
 final onlyIdentifierRegExp = new RegExp("^${identifierRegExp.pattern}\$");
 
@@ skipping 888 matching lines @@
   } else {
     throw new ApplicationException(message);
   }
 }
 
 /// Throw a [DataException] with [message] to indicate that the command has
 /// failed because of invalid input data.
 ///
 /// This will report the error and cause pub to exit with [exit_codes.DATA].
 void dataError(String message) => throw new DataException(message);