Replace base::File wrapping with typemapping.

components/filesystem/directory_impl.h

Index: components/filesystem/directory_impl.h
diff --git a/components/filesystem/directory_impl.h b/components/filesystem/directory_impl.h
index 9f1a141de4967775645123eb39e1e6ad231d9442..e226b78508e1c91308eb9d41b9e68bdaee6c4974 100644
--- a/components/filesystem/directory_impl.h
+++ b/components/filesystem/directory_impl.h
@@ -64,9 +64,8 @@ class DirectoryImpl : public mojom::Directory {
                  const WriteFileCallback& callback) override;
 
  private:
-  mojo::ScopedHandle OpenFileHandleImpl(const std::string& raw_path,
-                                        uint32_t open_flags,
-                                        mojom::FileError* error);
+  base::File OpenFileHandleImpl(const std::string& raw_path,
+                                uint32_t open_flags);
 
   base::FilePath directory_path_;
   scoped_refptr<SharedTempDir> temp_dir_;