Add control to use If-Range header for range request.

content/browser/download/parallel_download_job.cc

Index: content/browser/download/parallel_download_job.cc
diff --git a/content/browser/download/parallel_download_job.cc b/content/browser/download/parallel_download_job.cc
index b9df978537da94ee946704a3c3d0cb3d82dfa233..6785faad990ea89293e5f8dc1ccda803a4e66e01 100644
--- a/content/browser/download/parallel_download_job.cc
+++ b/content/browser/download/parallel_download_job.cc
@@ -209,6 +209,9 @@ void ParallelDownloadJob::CreateRequest(int64_t offset, int64_t length) {
   // file.
   download_params->set_length(length);
 
+  // Subsequent range requests don't need the "If-Range" header.
+  download_params->set_use_if_range(false);
+
   // Subsequent range requests have the same referrer URL as the original
   // download request.
   download_params->set_referrer(Referrer(download_item_->GetReferrerUrl(),