[Downloads] Gracefully handle SafeBrowsing check failures.

chrome/browser/download/download_item_model.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 119 matching lines @@
   // Change what's returned by WasUINotified().
   void SetWasUINotified(bool should_notify);
 
   // Returns |true| if opening in the browser is preferred for this download. If
   // |false|, the download should be opened with the system default application.
   bool ShouldPreferOpeningInBrowser() const;
 
   // 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().
   void OpenUsingPlatformHandler();
 
   content::DownloadItem* download() { return download_; }
 
  private:
   // Returns a string representations of the current download progress sizes. If
   // the total size of the download is known, this string looks like: "100/200
   // MB" where the numerator is the transferred size and the denominator is the
   // total size. If the total isn't known, returns the transferred size as a
   // string (e.g.: "100 MB").
   base::string16 GetProgressSizesString() const;
 
   // Returns a string indicating the status of an in-progress download.
   base::string16 GetInProgressStatusString() const;
 
   // The DownloadItem that this model represents. Note that DownloadItemModel
   // itself shouldn't maintain any state since there can be more than one
   // DownloadItemModel in use with the same DownloadItem.
   content::DownloadItem* download_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemModel);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H_