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

base/files/file_path_watcher.h

 // Copyright (c) 2012 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.
 
 // This module provides a way to monitor a file or directory for changes.
 
 #ifndef BASE_FILES_FILE_PATH_WATCHER_H_
 #define BASE_FILES_FILE_PATH_WATCHER_H_
 
 #include "base/base_export.h"
@@ skipping 44 matching lines @@
 
     // Stop watching. This is only called on the thread of the appropriate
     // message loop. Since it can also be called more than once, it should
     // check |is_cancelled()| to avoid duplicate work.
     virtual void CancelOnMessageLoopThread() = 0;
 
     scoped_refptr<base::SingleThreadTaskRunner> task_runner() const {
       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.
     void set_cancelled() {
       cancelled_ = true;
     }
 
     bool is_cancelled() const {
       return cancelled_;
     }
@@ skipping 25 matching lines @@
 
  private:
   scoped_refptr<PlatformDelegate> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(FilePathWatcher);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_PATH_WATCHER_H_