base: Use std::move() instead of Pass() for real movable types.

base/files/file_path_watcher.h

Index: base/files/file_path_watcher.h
diff --git a/base/files/file_path_watcher.h b/base/files/file_path_watcher.h
index 4f132aff78a9ff1ecaaac08ec945d0adc8028a49..834acbcde211523d1a3db6e590b64b5bc571ceac 100644
--- a/base/files/file_path_watcher.h
+++ b/base/files/file_path_watcher.h
@@ -62,9 +62,8 @@ class BASE_EXPORT FilePathWatcher {
       return task_runner_;
     }
 
-    void set_task_runner(
-        scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-      task_runner_ = task_runner.Pass();
+    void set_task_runner(scoped_refptr<base::SingleThreadTaskRunner> runner) {
+      task_runner_ = std::move(runner);
     }
 
     // Must be called before the PlatformDelegate is deleted.