MD Settings: Add "Auto Open" setting to Downloads page UI.

chrome/browser/ui/webui/settings/downloads_handler.h

Index: chrome/browser/ui/webui/settings/downloads_handler.h
diff --git a/chrome/browser/ui/webui/settings/downloads_handler.h b/chrome/browser/ui/webui/settings/downloads_handler.h
index b8c1561b97f0187c2421a66b1ee2d538ba978d01..289cf74ab82e4e7c70e5129d6a0a6affe79111b6 100644
--- a/chrome/browser/ui/webui/settings/downloads_handler.h
+++ b/chrome/browser/ui/webui/settings/downloads_handler.h
@@ -39,6 +39,9 @@ class DownloadsHandler : public SettingsPageUIHandler,
 
   void SendAutoOpenDownloadsToJavascript();
 
+  // Resets the list of filetypes that are auto-opened after download.
+  void HandleResetAutoOpenFileTypes(const base::ListValue* args);
+
   // Callback for the "selectDownloadLocation" message. This will prompt the
   // user for a destination folder using platform-specific APIs.
   void HandleSelectDownloadLocation(const base::ListValue* args);