Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/drive.

chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h

Index: chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
diff --git a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
index f5f1639f077d30ce2b589e2f072d2ace190e379e..daea7eef2bdf165452cf9b674594ad225b048019 100644
--- a/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
+++ b/chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h
@@ -25,26 +25,25 @@ namespace drive {
 class FileSystemBackendDelegate : public chromeos::FileSystemBackendDelegate {
  public:
   FileSystemBackendDelegate();
-  virtual ~FileSystemBackendDelegate();
+  ~FileSystemBackendDelegate() override;
 
   // FileSystemBackend::Delegate overrides.
-  virtual storage::AsyncFileUtil* GetAsyncFileUtil(
+  storage::AsyncFileUtil* GetAsyncFileUtil(
       storage::FileSystemType type) override;
-  virtual scoped_ptr<storage::FileStreamReader> CreateFileStreamReader(
+  scoped_ptr<storage::FileStreamReader> CreateFileStreamReader(
       const storage::FileSystemURL& url,
       int64 offset,
       int64 max_bytes_to_read,
       const base::Time& expected_modification_time,
       storage::FileSystemContext* context) override;
-  virtual scoped_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
+  scoped_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
       const storage::FileSystemURL& url,
       int64 offset,
       storage::FileSystemContext* context) override;
-  virtual storage::WatcherManager* GetWatcherManager(
+  storage::WatcherManager* GetWatcherManager(
       storage::FileSystemType type) override;
-  virtual void GetRedirectURLForContents(
-      const storage::FileSystemURL& url,
-      const storage::URLCallback& callback) override;
+  void GetRedirectURLForContents(const storage::FileSystemURL& url,
+                                 const storage::URLCallback& callback) override;
 
  private:
   scoped_ptr<storage::AsyncFileUtil> async_file_util_;