Fix watch move event when path is a not a file.

runtime/bin/file_system_watcher_macos.cc

Index: runtime/bin/file_system_watcher_macos.cc
diff --git a/runtime/bin/file_system_watcher_macos.cc b/runtime/bin/file_system_watcher_macos.cc
index c524e36f42b5db1a3a1fae5eadcd3310d7f2d09a..678f45f20b59b025ba4975f50297bfecbd063638 100644
--- a/runtime/bin/file_system_watcher_macos.cc
+++ b/runtime/bin/file_system_watcher_macos.cc
@@ -181,7 +181,7 @@ class FSEventsWatcher {
     for (size_t i = 0; i < num_events; i++) {
       char *path = reinterpret_cast<char**>(event_paths)[i];
       FSEvent event;
-      event.data.exists = File::Exists(path);
+      event.data.exists = File::GetType(path, false) != File::kDoesNotExist;
       path += node->base_path_length();
       // If path is longer the base, skip next character ('/').
       if (path[0] != '\0') path += 1;