Add prefix to path import to work around breaking change

pkg/analyzer/test/file_system/memory_file_system_test.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.test.file_system.memory_file_system_test;
 
 import 'dart:async';
 import 'dart:core';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/engine.dart' show TimestampedData;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
-import 'package:path/path.dart';
+import 'package:path/path.dart' as pathos;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:watcher/watcher.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(FileSystemExceptionTest);
     defineReflectiveTests(FileTest);
     defineReflectiveTests(FolderTest);
     defineReflectiveTests(MemoryFileSourceExistingTest);
@@ skipping 431 matching lines @@
     source = file.createSource();
   }
 
   void test_contents() {
     TimestampedData<String> contents = source.contents;
     expect(contents.data, 'library test;');
   }
 
   void test_encoding() {
     String expected = 'file:///foo/test.dart';
-    if (provider.pathContext.style == windows.style) {
+    if (provider.pathContext.style == pathos.windows.style) {
       expected = 'file:///C:/foo/test.dart';
     }
     expect(source.encoding, expected);
   }
 
   void test_equals_false_differentFile() {
     File fileA = provider.newFile(provider.convertPath('/foo/a.dart'), '');
     File fileB = provider.newFile(provider.convertPath('/foo/b.dart'), '');
     Source sourceA = fileA.createSource();
     Source sourceB = fileB.createSource();
@@ skipping 66 matching lines @@
   }
 
   void test_contents() {
     expect(() {
       source.contents;
     }, throwsA(_isFileSystemException));
   }
 
   void test_encoding() {
     String expected = 'file:///foo/test.dart';
-    if (provider.pathContext.style == windows.style) {
+    if (provider.pathContext.style == pathos.windows.style) {
       expected = 'file:///C:/foo/test.dart';
     }
     expect(source.encoding, expected);
   }
 
   void test_exists() {
     expect(source.exists(), isFalse);
   }
 
   void test_fullName() {
@@ skipping 44 matching lines @@
   void test_deleteFile_success() {
     String path = provider.convertPath('/my/file');
     provider.newFile(path, 'contents');
     Resource file = provider.getResource(path);
     expect(file, new isInstanceOf<File>());
     expect(file.exists, isTrue);
     provider.deleteFile(path);
     expect(file.exists, isFalse);
   }
 
-  test_getModificationTimes() async {
-    File file = provider.newFile(provider.convertPath('/test.dart'), '');
-    Source source = file.createSource();
-    List<int> times = await provider.getModificationTimes([source]);
-    expect(times, [source.modificationStamp]);
-  }
-
   test_getFolder_existing() async {
     String path = provider.convertPath('/foo/bar');
     provider.newFolder(path);
     Folder folder = provider.getFolder(path);
     expect(folder, isNotNull);
     expect(folder.path, path);
     expect(folder.exists, isTrue);
   }
 
   test_getFolder_notExisting() async {
     String path = provider.convertPath('/foo/bar');
     Folder folder = provider.getFolder(path);
     expect(folder, isNotNull);
     expect(folder.path, path);
     expect(folder.exists, isFalse);
   }
 
+  test_getModificationTimes() async {
+    File file = provider.newFile(provider.convertPath('/test.dart'), '');
+    Source source = file.createSource();
+    List<int> times = await provider.getModificationTimes([source]);
+    expect(times, [source.modificationStamp]);
+  }
+
   void test_getStateLocation_uniqueness() {
     String idOne = 'one';
     Folder folderOne = provider.getStateLocation(idOne);
     expect(folderOne, isNotNull);
     String idTwo = 'two';
     Folder folderTwo = provider.getStateLocation(idTwo);
     expect(folderTwo, isNotNull);
     expect(folderTwo, isNot(equals(folderOne)));
     expect(provider.getStateLocation(idOne), equals(folderOne));
   }
@@ skipping 133 matching lines @@
     return new Future.delayed(Duration.ZERO, computation);
   }
 
   _watchingFolder(String path, test(List<WatchEvent> changesReceived)) {
     Folder folder = provider.getResource(path);
     var changesReceived = <WatchEvent>[];
     folder.changes.listen(changesReceived.add);
     return test(changesReceived);
   }
 }