RefCounted types should not have public destructors, base/ edition

base/files/file_path_watcher_kqueue.cc

Index: base/files/file_path_watcher_kqueue.cc
diff --git a/base/files/file_path_watcher_kqueue.cc b/base/files/file_path_watcher_kqueue.cc
index d4ddb7dae62f7817a60e5faab621043fa8c06973..853dcc82787ef6af97bc1915e51d98cd874a1d45 100644
--- a/base/files/file_path_watcher_kqueue.cc
+++ b/base/files/file_path_watcher_kqueue.cc
@@ -54,7 +54,6 @@ class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate,
                             public MessageLoop::DestructionObserver {
  public:
   FilePathWatcherImpl() : kqueue_(-1) {}
-  virtual ~FilePathWatcherImpl() {}
 
   // MessageLoopForIO::Watcher overrides.
   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
@@ -69,6 +68,8 @@ class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate,
   virtual void Cancel() OVERRIDE;
 
  private:
+  virtual ~FilePathWatcherImpl() {}
+
   class EventData {
    public:
     EventData(const FilePath& path, const FilePath::StringType& subdir)