Getting service process on Mac to handle having things moved/changed underneath it.

base/file_path_component_watcher.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Cross platform methods for FilePathWatcher. See the various platform
+// specific implementation files, too.
+
+#include "base/file_path_component_watcher.h"
+#include "base/logging.h"
+
+namespace base {
+
+FilePathComponentWatcher::~FilePathComponentWatcher() {
+  impl_->Cancel();
+}
+
+bool FilePathComponentWatcher::Watch(const FilePath& path,
+                                     Delegate* delegate) {
+  DCHECK(path.IsAbsolute());
+  return impl_->Watch(path, delegate);
+}
+
+}  // namespace base