base::Bind: Convert FilePathWatcher.

base/files/file_path_watcher_linux.cc

Index: base/files/file_path_watcher_linux.cc
diff --git a/base/files/file_path_watcher_linux.cc b/base/files/file_path_watcher_linux.cc
index c9be4bacdde0493e3556fbabbcf8ebb8b28a4f08..86c963c4fc60a20f3a4be1f79873cc6495d07cb6 100644
--- a/base/files/file_path_watcher_linux.cc
+++ b/base/files/file_path_watcher_linux.cc
@@ -412,7 +412,8 @@ void FilePathWatcherImpl::Cancel() {
   // Switch to the message_loop_ if necessary so we can access |watches_|.
   if (!message_loop()->BelongsToCurrentThread()) {
     message_loop()->PostTask(FROM_HERE,
-                             new FilePathWatcher::CancelTask(this));
+                             base::Bind(&FilePathWatcher::CancelWatch,
+                                        make_scoped_refptr(this)));
   } else {
     CancelOnMessageLoopThread();
   }