[Downloads] Gracefully handle SafeBrowsing check failures.

chrome/browser/download/download_item_model.h

Index: chrome/browser/download/download_item_model.h
diff --git a/chrome/browser/download/download_item_model.h b/chrome/browser/download/download_item_model.h
index 367e9ef677d515ff83640d87146a4d508e1c58b0..68444ec7b4ec85fc4a61f85a7f04a9f7ef73dbb1 100644
--- a/chrome/browser/download/download_item_model.h
+++ b/chrome/browser/download/download_item_model.h
@@ -137,6 +137,16 @@ class DownloadItemModel {
   // Change what's returned by ShouldPreferOpeningInBrowser to |preference|.
   void SetShouldPreferOpeningInBrowser(bool preference);
 
+  // Mark that the download should be considered dangerous based on the file
+  // type. This value may differ from the download's danger type in cases where
+  // the SafeBrowsing service hasn't returned a verdict about the download. If
+  // SafeBrowsing fails to return a decision, then the download should be
+  // considered dangerous based on this flag. Defaults to false.
+  bool IsDangerousFileBasedOnType() const;
+
+  // Change what's returned by IsDangerousFileBasedOnType().
+  void SetIsDangerousFileBasedOnType(bool dangerous);
+
   // Open the download using the platform handler for the download. The behavior
   // of this method will be different from DownloadItem::OpenDownload() if
   // ShouldPreferOpeningInBrowser().