Remove ref-counting from FilePathWatcher.

base/files/file_path_watcher_kqueue.h

 // Copyright 2014 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.
 
 #ifndef BASE_FILES_FILE_PATH_WATCHER_KQUEUE_H_
 #define BASE_FILES_FILE_PATH_WATCHER_KQUEUE_H_
 
 #include <sys/event.h>
 
 #include <memory>
@@ skipping 13 matching lines @@
 // - modifications to the paths to a watched object that would affect the
 //   object such as renaming/attibute changes etc.
 // The kqueue implementation will handle all of the items in the list above
 // except for detecting modifications to files in a watched directory. It will
 // detect the creation and deletion of files, just not the modification of
 // files. It does however detect the attribute changes that the FSEvents impl
 // would miss.
 class FilePathWatcherKQueue : public FilePathWatcher::PlatformDelegate {
  public:
   FilePathWatcherKQueue();
+  ~FilePathWatcherKQueue() override;
 
   // FilePathWatcher::PlatformDelegate overrides.
   bool Watch(const FilePath& path,
              bool recursive,
              const FilePathWatcher::Callback& callback) override;
   void Cancel() override;
 
- protected:
-  ~FilePathWatcherKQueue() override;
-
  private:
   class EventData {
    public:
     EventData(const FilePath& path, const FilePath::StringType& subdir)
         : path_(path), subdir_(subdir) { }
     FilePath path_;  // Full path to this item.
     FilePath::StringType subdir_;  // Path to any sub item.
   };
 
   typedef std::vector<struct kevent> EventVector;
@@ skipping 64 matching lines @@
   // Throughout the lifetime of this, OnKQueueReadable() will be called when
   // data is available in |kqueue_|.
   std::unique_ptr<FileDescriptorWatcher::Controller> kqueue_watch_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(FilePathWatcherKQueue);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_PATH_WATCHER_KQUEUE_H_