Normalize test paths.

BUG=
R=nweiz@google.com

Review URL: https://codereview.chromium.org//23183006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@26160 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/pkgs/watcher/test/utils.dart b/pkgs/watcher/test/utils.dart
index 18bec97..3bbe0e1 100644
--- a/pkgs/watcher/test/utils.dart
+++ b/pkgs/watcher/test/utils.dart
@@ -109,7 +109,10 @@
 /// Validates that events are delivered for all paths in [paths], but allows
 /// them in any order.
 void expectEvents(ChangeType type, Iterable<String> paths) {
-  var pathSet = paths.map((path) => p.join(_sandboxDir, path)).toSet();
+  var pathSet = paths
+      .map((path) => p.join(_sandboxDir, path))
+      .map(p.normalize)
+      .toSet();
 
   // Create an expectation for as many paths as we have.
   var futures = [];