Fix summary tests on Windows.

pkg/analyzer/test/src/summary/summary_common.dart

 // Copyright (c) 2015, 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.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
-import 'package:analyzer/src/generated/java_engine_io.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/base.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/public_namespace_computer.dart'
     as public_namespace;
 import 'package:analyzer/src/summary/summarize_elements.dart'
     as summarize_elements;
+import 'package:path/path.dart' show posix;
 import 'package:unittest/unittest.dart';
 
 import '../context/mock_sdk.dart';
 
 /**
- * Convert [path] to a suitably formatted absolute path URI for the current
- * platform.
+ * Convert the given Posix style file [path] to the corresponding absolute URI.
  */
 String absUri(String path) {
-  return FileUtilities2.createFile(path).toURI().toString();
+  String absolutePath = posix.absolute(path);
+  return posix.toUri(absolutePath).toString();
 }
 
 /**
  * Convert a summary object (or a portion of one) into a canonical form that
  * can be easily compared using [expect].  If [orderByName] is true, and the
  * object is a [List], it is sorted by the `name` field of its elements.
  */
 Object canonicalize(Object obj, {bool orderByName: false}) {
   if (obj is SummaryClass) {
     Map<String, Object> result = <String, Object>{};
@@ skipping 10482 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }