[Downloads] Always call DM::StartDownload() for explicit downloads.

chrome/browser/extensions/api/downloads/downloads_api.cc

Index: chrome/browser/extensions/api/downloads/downloads_api.cc
diff --git a/chrome/browser/extensions/api/downloads/downloads_api.cc b/chrome/browser/extensions/api/downloads/downloads_api.cc
index 0a297d2116bd4a67bd2bed82ea1b9fbfa9a1556f..c8fc9921f1a7da08effe28cd23b0bc691ee5a2cd 100644
--- a/chrome/browser/extensions/api/downloads/downloads_api.cc
+++ b/chrome/browser/extensions/api/downloads/downloads_api.cc
@@ -1038,7 +1038,6 @@ void DownloadsDownloadFunction::OnStarted(
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   VLOG(1) << __FUNCTION__ << " " << item << " " << interrupt_reason;
   if (item) {
-    DCHECK_EQ(content::DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
     SetResult(new base::FundamentalValue(static_cast<int>(item->GetId())));
     if (!creator_suggested_filename.empty() ||
         (creator_conflict_action !=
@@ -1056,7 +1055,6 @@ void DownloadsDownloadFunction::OnStarted(
     new DownloadedByExtension(item, extension()->id(), extension()->name());
     item->UpdateObservers();
   } else {
-    DCHECK_NE(content::DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
     error_ = content::DownloadInterruptReasonToString(interrupt_reason);
   }
   SendResponse(error_.empty());