Make the download's response headers available in the DownloadItem

content/browser/download/download_item_impl.h

Index: content/browser/download/download_item_impl.h
diff --git a/content/browser/download/download_item_impl.h b/content/browser/download/download_item_impl.h
index f7915d739ec5659580d99b78f2d0f9519186e60c..557cec706c6537b3b225ead7412c4dedd480c843 100644
--- a/content/browser/download/download_item_impl.h
+++ b/content/browser/download/download_item_impl.h
@@ -130,6 +130,7 @@ class CONTENT_EXPORT DownloadItemImpl
   const GURL& GetTabUrl() const override;
   const GURL& GetTabReferrerUrl() const override;
   std::string GetSuggestedFilename() const override;
+  int GetResponseCode() const override;
   std::string GetContentDisposition() const override;
   std::string GetMimeType() const override;
   std::string GetOriginalMimeType() const override;
@@ -568,7 +569,12 @@ class CONTENT_EXPORT DownloadItemImpl
   // Whether the download was triggered with a user gesture.
   bool has_user_gesture_ = false;
 
-  // Information from the request.
+  // Information from the response.
+
+  // The HTTP response code. This is 0 when the response has not yet been
+  // received or if the response code text could not be parsed.
+  int response_code_ = 0;
+
   // Content-disposition field from the header.
   std::string content_disposition_;