Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

chrome/browser/ui/views/notifications/balloon_view_views.cc

Index: chrome/browser/ui/views/notifications/balloon_view_views.cc
diff --git a/chrome/browser/ui/views/notifications/balloon_view_views.cc b/chrome/browser/ui/views/notifications/balloon_view_views.cc
index dc608c0aa068fe9f40d159a15d143970c25b5e12..d6dc95665d91ce8dc5d0db0b843cffa1614746bf 100644
--- a/chrome/browser/ui/views/notifications/balloon_view_views.cc
+++ b/chrome/browser/ui/views/notifications/balloon_view_views.cc
@@ -149,6 +149,7 @@ void BalloonViewImpl::OnMenuButtonClicked(views::View* source,
           options_menu_button_,
           gfx::Rect(screen_location, options_menu_button_->size()),
           views::MenuItemView::TOPRIGHT,
+          ui::MENU_SOURCE_NONE,
           views::MenuRunner::HAS_MNEMONICS) == views::MenuRunner::MENU_DELETED)
     return;
 }