base: Remove some unnecessary const scoped_refptr<>&.

base/files/important_file_writer.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.
 
 #ifndef BASE_FILES_IMPORTANT_FILE_WRITER_H_
 #define BASE_FILES_IMPORTANT_FILE_WRITER_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 45 matching lines @@
   // Blocks and writes data on the current thread.
   static bool WriteFileAtomically(const FilePath& path,
                                   const std::string& data);
 
   // Initialize the writer.
   // |path| is the name of file to write.
   // |task_runner| is the SequencedTaskRunner instance where on which we will
   // execute file I/O operations.
   // All non-const methods, ctor and dtor must be called on the same thread.
   ImportantFileWriter(const FilePath& path,
-                      const scoped_refptr<SequencedTaskRunner>& task_runner);
+                      scoped_refptr<SequencedTaskRunner> task_runner);
 
   // Same as above, but with a custom commit interval.
   ImportantFileWriter(const FilePath& path,
-                      const scoped_refptr<SequencedTaskRunner>& task_runner,
+                      scoped_refptr<SequencedTaskRunner> task_runner,
                       TimeDelta interval);
 
   // You have to ensure that there are no pending writes at the moment
   // of destruction.
   ~ImportantFileWriter();
 
   const FilePath& path() const { return path_; }
 
   // Returns true if there is a scheduled write pending which has not yet
   // been started.
@@ skipping 50 matching lines @@
   const TimeDelta commit_interval_;
 
   WeakPtrFactory<ImportantFileWriter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImportantFileWriter);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_IMPORTANT_FILE_WRITER_H_