[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 12cd1d16e1aa561b88a7448a759c0cbb56513a4f..5fd5873d71a7dc063de0b0510b4b0602341d424c 100644
--- a/chrome/browser/extensions/api/downloads/downloads_api.cc
+++ b/chrome/browser/extensions/api/downloads/downloads_api.cc
@@ -1045,7 +1045,6 @@ void DownloadsDownloadFunction::OnStarted(
   DCHECK(BrowserThread::CurrentlyOn(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()) {
       ExtensionDownloadsEventRouterData* data =
@@ -1062,7 +1061,6 @@ void DownloadsDownloadFunction::OnStarted(
         item, GetExtension()->id(), GetExtension()->name());
     item->UpdateObservers();
   } else {
-    DCHECK_NE(content::DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
     error_ = content::DownloadInterruptReasonToString(interrupt_reason);
   }
   SendResponse(error_.empty());