Standardize usage of virtual/override/final in chrome/browser/sync_file_system/

chrome/browser/sync_file_system/local/syncable_file_system_operation.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/sync_file_system/local/syncable_file_system_operation.h"
 
 #include "base/logging.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
 #include "chrome/browser/sync_file_system/local/syncable_file_operation_runner.h"
@@ skipping 22 matching lines @@
 
 class SyncableFileSystemOperation::QueueableTask
     : public SyncableFileOperationRunner::Task {
  public:
   QueueableTask(base::WeakPtr<SyncableFileSystemOperation> operation,
                 const base::Closure& task)
       : operation_(operation),
         task_(task),
         target_paths_(operation->target_paths_) {}
 
-  virtual ~QueueableTask() {
-    DCHECK(!operation_);
-  }
+  ~QueueableTask() override { DCHECK(!operation_); }
 
-  virtual void Run() override {
+  void Run() override {
     if (!operation_)
       return;
     DCHECK(!task_.is_null());
     task_.Run();
     operation_.reset();
   }
 
-  virtual void Cancel() override {
+  void Cancel() override {
     DCHECK(!task_.is_null());
     if (operation_)
       operation_->OnCancelled();
     task_.Reset();
     operation_.reset();
   }
 
-  virtual const std::vector<FileSystemURL>& target_paths() const override {
+  const std::vector<FileSystemURL>& target_paths() const override {
     return target_paths_;
   }
 
  private:
   base::WeakPtr<SyncableFileSystemOperation> operation_;
   base::Closure task_;
   std::vector<FileSystemURL> target_paths_;
   DISALLOW_COPY_AND_ASSIGN(QueueableTask);
 };
 
@@ skipping 315 matching lines @@
     operation_runner_->OnOperationCompleted(target_paths_);
   callback.Run(result, bytes, complete);
 }
 
 void SyncableFileSystemOperation::OnCancelled() {
   DCHECK(!completion_callback_.is_null());
   completion_callback_.Run(base::File::FILE_ERROR_ABORT);
 }
 
 }  // namespace sync_file_system