Don't prompt to save malicious downloads on exit

content/public/browser/download_manager.h

Index: content/public/browser/download_manager.h
diff --git a/content/public/browser/download_manager.h b/content/public/browser/download_manager.h
index 37c6d09da908f41dfdd78294aa55213577f244e8..40c33e9f40994aa9a3204605ec15a3572fd4a77b 100644
--- a/content/public/browser/download_manager.h
+++ b/content/public/browser/download_manager.h
@@ -158,6 +158,12 @@ class CONTENT_EXPORT DownloadManager : public base::SupportsUserData::Data {
   // is too slow, use an AllDownloadItemNotifier to count in-progress items.
   virtual int InProgressCount() const = 0;
 
+  // The number of in progress (including paused) downloads.
+  // Performance note: this loops over all items. If profiling finds that this
+  // is too slow, use an AllDownloadItemNotifier to count in-progress items.
+  // This excludes downloads that are marked as any kind of dangerous.
+  virtual int NonDangerousInProgressCount() const = 0;
+
   virtual BrowserContext* GetBrowserContext() const = 0;
 
   // Checks whether downloaded files still exist. Updates state of downloads