Fix use after free in SearchResultTileItemView

ui/app_list/views/search_result_tile_item_view.cc

Index: ui/app_list/views/search_result_tile_item_view.cc
diff --git a/ui/app_list/views/search_result_tile_item_view.cc b/ui/app_list/views/search_result_tile_item_view.cc
index 3a8ecbe06be630b9581e64b5d75a3ab50d1ac99f..123e5156f3f4d69ab35a7ac710c1d18dd706fa73 100644
--- a/ui/app_list/views/search_result_tile_item_view.cc
+++ b/ui/app_list/views/search_result_tile_item_view.cc
@@ -76,6 +76,9 @@ void SearchResultTileItemView::OnIconChanged() {
 }
 
 void SearchResultTileItemView::OnResultDestroying() {
+  // The menu comes from |item_|. If we're showing a menu we need to cancel it.
+  context_menu_runner_.reset();
+
   if (item_)
     item_->RemoveObserver(this);
   item_ = NULL;