Fix a crash when downloading a dangerous download

chrome/browser/android/download/download_controller.cc

Index: chrome/browser/android/download/download_controller.cc
diff --git a/chrome/browser/android/download/download_controller.cc b/chrome/browser/android/download/download_controller.cc
index 908b121896e53be78a268d17a61217f11891248d..c77b0f282df2296204a05c8ee2f9d44748d1b436 100644
--- a/chrome/browser/android/download/download_controller.cc
+++ b/chrome/browser/android/download/download_controller.cc
@@ -243,7 +243,9 @@ void DownloadController::OnDownloadStarted(
 
   ChromeDownloadDelegate* delegate =
       ChromeDownloadDelegate::FromWebContents(web_contents);
-  if (delegate) {
+  // For dangerous item, we need to show the dangerous infobar before the
+  // download can start.
+  if (!download_item->IsDangerous() && delegate) {
     delegate->OnDownloadStarted(
         download_item->GetTargetFilePath().BaseName().value());
   }