Rename "pathos" package to "path".

pkg/stack_trace/test/vm_test.dart

 // Copyright (c) 2013, 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.
 
 /// This file tests stack_trace's ability to parse live stack traces. It's a
 /// dual of dartium_test.dart, since method names can differ somewhat from
 /// platform to platform. No similar file exists for dart2js since the specific
 /// method names there are implementation details.
 
-import 'package:pathos/path.dart' as path;
+import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/unittest.dart';
 
 String getStackTraceString() {
   try {
     throw '';
   } catch (_, stackTrace) {
     return stackTrace.toString();
   }
 }
@@ skipping 79 matching lines @@
 
     test('at level 2 returns the grandparent frame', () {
       expect(nestedGetCaller(2).member, equals('main.<fn>.<fn>'));
     });
 
     test('throws an ArgumentError for negative levels', () {
       expect(() => new Frame.caller(-1), throwsArgumentError);
     });
   });
 }