set content length limit if half open range request fails

content/browser/download/download_job.h

Index: content/browser/download/download_job.h
diff --git a/content/browser/download/download_job.h b/content/browser/download/download_job.h
index 25635309c94a5bd4eb9ccc3387dafcba0270ebd0..d4db0ece9889c4b710066fa2b0b20231f55cc4fa 100644
--- a/content/browser/download/download_job.h
+++ b/content/browser/download/download_job.h
@@ -53,6 +53,9 @@ class CONTENT_EXPORT DownloadJob {
                      int64_t offset,
                      int64_t length);
 
+  // Sets the potential length of the file.
+  void SetPotentialFileLength(int64_t length);
+
   DownloadItemImpl* download_item_;
 
  private: