Fix asset and SDK path detection.

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';
 
-// This is used by [libraryPath]. It must be kept up-to-date with all libraries
-// whose paths are looked up using that function.
-@MirrorsUsed(targets: const ['pub.io', 'test_pub'])
-import 'dart:mirrors';
-
 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';
 
 /// 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
@@ skipping 745 matching lines @@
   });
   return Future.wait(pairs).then((resolvedPairs) {
     var map = {};
     for (var pair in resolvedPairs) {
       map[pair.first] = pair.last;
     }
     return map;
   });
 }
 
-/// Returns the path to the library named [libraryName].
-///
-/// The library name must be globally unique, or the wrong library path may be
-/// returned. Any libraries accessed must be added to the [MirrorsUsed]
-/// declaration in the import above.
-String libraryPath(String libraryName) {
-  var lib = currentMirrorSystem().findLibrary(new Symbol(libraryName));
-  return path.fromUri(lib.uri);
-}
-
 /// Whether "special" strings such as Unicode characters or color escapes are
 /// safe to use.
 ///
 /// On Windows or when not printing to a terminal, only printable ASCII
 /// characters should be used.
 bool get canUseSpecialChars => !runningAsTest &&
     Platform.operatingSystem != 'windows' &&
     stdioType(stdout) == StdioType.TERMINAL;
 
 /// Gets a "special" string (ANSI escape or Unicode).
@@ skipping 126 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);