Remove several references to JavaFile

pkg/analysis_server/test/single_context_manager_test.dart

Index: pkg/analysis_server/test/single_context_manager_test.dart
diff --git a/pkg/analysis_server/test/single_context_manager_test.dart b/pkg/analysis_server/test/single_context_manager_test.dart
index d85214a9a326d9f356f60f544b47836972511e83..eb3ce8c0cd8d7883624c27671f69abb3e9e3e576 100644
--- a/pkg/analysis_server/test/single_context_manager_test.dart
+++ b/pkg/analysis_server/test/single_context_manager_test.dart
@@ -9,7 +9,6 @@ import 'dart:core' hide Resource;
 import 'package:analysis_server/src/single_context_manager.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
@@ -45,7 +44,7 @@ class SingleContextManagerTest {
       '**/*.${AnalysisEngine.SUFFIX_HTML}',
     ];
     return patterns
-        .map((pattern) => new Glob(JavaFile.pathContext.separator, pattern))
+        .map((pattern) => new Glob(posix.separator, pattern))
         .toList();
   }