Really really fix the build...

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 d06e2d79491c53c5c5b209e708cfe2c7efde5ece..30322c87aae70af0cb674b90c614f0f6060acd8e 100644
--- a/runtime/bin/file_system_watcher_macos.cc
+++ b/runtime/bin/file_system_watcher_macos.cc
@@ -242,7 +242,7 @@ class FSEventsWatcher {
 
   static void StopCallback(CFRunLoopTimerRef timer, void* info) {
     FSEventsWatcher* watcher = reinterpret_cast<FSEventsWatcher*>(info);
-    ASSERT(Thread::Compare(node->watcher_->threadId_,
+    ASSERT(Thread::Compare(watcher->threadId_,
                            Thread::GetCurrentThreadId()));
     CFRunLoopStop(watcher->run_loop_);
   }
@@ -279,7 +279,7 @@ class FSEventsWatcher {
                        const FSEventStreamEventFlags event_flags[],
                        const FSEventStreamEventId event_ids[]) {
     Node* node = reinterpret_cast<Node*>(client);
-    ASSERT(Thread::Compare(node->watcher_->threadId_,
+    ASSERT(Thread::Compare(node->watcher()->threadId_,
                            Thread::GetCurrentThreadId()));
     // `ready` is set on same thread as this callback is invoked, so we don't
     // need to lock here.