[remoting host] Only watch for material changes to NSS DB files

remoting/host/linux/certificate_watcher.h

Index: remoting/host/linux/certificate_watcher.h
diff --git a/remoting/host/linux/certificate_watcher.h b/remoting/host/linux/certificate_watcher.h
index 5dee61d3cff6d6e6f1274751e996d94c36228613..958e2ab4479cc56751393fa0138b0fff467ce69f 100644
--- a/remoting/host/linux/certificate_watcher.h
+++ b/remoting/host/linux/certificate_watcher.h
@@ -17,6 +17,8 @@
 
 namespace remoting {
 
+class CertificateWatcherImpl;
+
 // This class watches the cert database and notifies the host to restart when
 // a change of the database is detected. The runner script will restart the host
 // when the host is killed then the new host will capture any new changes of the
@@ -56,17 +58,13 @@ class CertificateWatcher : public remoting::HostStatusObserver {
   void SetWatchPathForTests(const base::FilePath& watch_path);
 
  private:
+  friend class CertificateWatcherImpl;
+
   // Returns true if the watcher has started.
   bool is_started() const;
 
-  // Callback passed to |file_watcher_|. Runs in IO thread.
-  static void OnCertDirectoryChanged(
-      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
-      base::WeakPtr<CertificateWatcher> watcher_, const base::FilePath& path,
-      bool error);
-
   // Runs in the caller's thread.
-  void DirectoryChanged(const base::FilePath& path, bool error);
+  void DatabaseChanged(const base::FilePath& path, bool error);
 
   // Called by |restart_timer_| when it's time to reset the host.
   // It will defer restart if |inhibit_restart_scheduled_| flag is set to true.
@@ -91,8 +89,8 @@ class CertificateWatcher : public remoting::HostStatusObserver {
   // Path of the certificate files/directories.
   base::FilePath cert_watch_path_;
 
-  // The file watcher to watch changes inside the certificate folder.
-  std::unique_ptr<base::FilePathWatcher> file_watcher_;
+  // The watcher implementation that watches the files on the IO thread.
+  std::unique_ptr<CertificateWatcherImpl> watcher_impl_;
 
   // The time to wait to restart when it is scheduled.
   base::TimeDelta delay_;