Don't create parallel request until download file is initialized

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 e83df49104f09f0bc824521a7f51cf6a5268da14..1b3eeb8e9b3a3ee5f8c22d3028f0478c365ed957 100644
--- a/content/browser/download/parallel_download_job.cc
+++ b/content/browser/download/parallel_download_job.cc
@@ -34,10 +34,12 @@ ParallelDownloadJob::ParallelDownloadJob(
 
 ParallelDownloadJob::~ParallelDownloadJob() = default;
 
-void ParallelDownloadJob::Start() {
-  DownloadJobImpl::Start();
-
-  BuildParallelRequestAfterDelay();
+void ParallelDownloadJob::OnDownloadFileInitialized(
+    const DownloadFile::InitializeCallback& callback,
+    DownloadInterruptReason result) {
+  DownloadJobImpl::OnDownloadFileInitialized(callback, result);
+  if (result == DOWNLOAD_INTERRUPT_REASON_NONE)
+    BuildParallelRequestAfterDelay();
 }
 
 void ParallelDownloadJob::Cancel(bool user_cancel) {