ImageWriter: Add ShouldResetImageWriter helper

chrome/utility/image_writer/image_writer_handler.h

Index: chrome/utility/image_writer/image_writer_handler.h
diff --git a/chrome/utility/image_writer/image_writer_handler.h b/chrome/utility/image_writer/image_writer_handler.h
index d61fc91b5dccd592b38dd45a7bbb26b07f9fed28..3ca1fcf5219d8aae9079fec1541423c4f52cf0b3 100644
--- a/chrome/utility/image_writer/image_writer_handler.h
+++ b/chrome/utility/image_writer/image_writer_handler.h
@@ -41,6 +41,9 @@ class ImageWriterHandler {
  private:
   void Cancel();
 
+  bool ShouldResetImageWriter(const base::FilePath& image,
+                              const base::FilePath& device);
+
   extensions::mojom::RemovableStorageWriterClientPtr client_;
   std::unique_ptr<ImageWriter> image_writer_;
 };