Change tests to prepare for turning on the permission bubble flag.

chrome/browser/download/download_permission_request.cc

Index: chrome/browser/download/download_permission_request.cc
diff --git a/chrome/browser/download/download_permission_request.cc b/chrome/browser/download/download_permission_request.cc
index c8ac3db4fab19736fb7764ee3f1cf3d912008de1..df76a3773f12f4f7d9edfbf0c555a73f2c4c105d 100644
--- a/chrome/browser/download/download_permission_request.cc
+++ b/chrome/browser/download/download_permission_request.cc
@@ -28,8 +28,8 @@ base::string16 DownloadPermissionRequest::GetMessageTextFragment() const {
 }
 
 bool DownloadPermissionRequest::HasUserGesture() const {
-  // TODO(gbillock): user gesture for multiple downloads is difficult to
-  // propagate, and the normal thing is that it is background.
+  // Only non-gestured requests go through the path of the download request
+  // limiter, so always return false.
   return false;
 }