Do not create display_change_listener for parent=NULL.

The status_icon_win is not backed by any widget, so it is natural to pass |parent| to NULL and it seems to make sense that it won't have display_change_listener in that case.

BUG=181027


Review URL: https://chromiumcodereview.appspot.com/12658003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187356 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed