Update the Mac OS watcher in pkg/watcher.

pkg/watcher/test/directory_watcher/mac_os_test.dart

Index: pkg/watcher/test/directory_watcher/mac_os_test.dart
diff --git a/pkg/watcher/test/directory_watcher/mac_os_test.dart b/pkg/watcher/test/directory_watcher/mac_os_test.dart
index 7d31221dec73c355143a66cde8c2922bca0f9d9e..b1f16662862d54337dfda0d45480347054e2a42a 100644
--- a/pkg/watcher/test/directory_watcher/mac_os_test.dart
+++ b/pkg/watcher/test/directory_watcher/mac_os_test.dart
@@ -52,28 +52,6 @@ main() {
     withPermutations((i, j, k) =>
         writeFile("dir/sub/sub-$i/sub-$j/file-$k.txt"));
 
-    // We sleep here because a narrow edge case caused by two interacting bugs
-    // can produce events that aren't expected if we start the watcher too
-    // soon after creating the files above. Here's what happens:
-    //
-    // * We create "dir/sub" and its contents above.
-    //
-    // * We initialize the watcher watching "dir".
-    //
-    // * Due to issue 14373, the watcher can receive native events describing
-    //   the creation of "dir/sub" and its contents despite the fact that they
-    //   occurred before the watcher was started.
-    //
-    // * Usually the above events will occur while the watcher is doing its
-    //   initial scan of "dir/sub" and be ignored, but occasionally they will
-    //   occur afterwards.
-    //
-    // * When processing the bogus CREATE events, the watcher has to assume that
-    //   they could mean something other than CREATE (issue 14793). Thus it
-    //   assumes that the files or directories in question could have changed
-    //   and emits CHANGE events or additional REMOVE/CREATE pairs for them.
-    schedule(() => new Future.delayed(new Duration(seconds: 2)));
-
     startWatcher(dir: "dir");
 
     renameDir("dir/sub", "sub");