Detect file system errors during downloads.

chrome/browser/download/download_file_manager.h

Index: chrome/browser/download/download_file_manager.h
diff --git a/chrome/browser/download/download_file_manager.h b/chrome/browser/download/download_file_manager.h
index 2b52636c03d3866a0f412d05eb6f49aaedd3fcd7..e57c079caee532d816fab2dfce684e52edf74d21 100644
--- a/chrome/browser/download/download_file_manager.h
+++ b/chrome/browser/download/download_file_manager.h
@@ -88,7 +88,7 @@ class DownloadFileManager
   // was not performed securely.
   void OnResponseCompleted(int id,
                            DownloadBuffer* buffer,
-                           int os_error,
+                           int net_error,
                            const std::string& security_info);
 
   // Handlers for notifications sent from the UI thread and run on the
@@ -147,7 +147,8 @@ class DownloadFileManager
 
   // Called only from RenameInProgressDownloadFile and
   // RenameCompletingDownloadFile on the FILE thread.
-  void CancelDownloadOnRename(int id);
+  // |rename_error| indicates what error caused the cancel.
+  void CancelDownloadOnRename(int id, int rename_error);
 
   // Erases the download file with the given the download |id| and removes
   // it from the maps.