Handle sync changes on the Start Page tiles while context menus are showing.

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 ae3d8b43f3022a8bd4ed45a134f7f909f93c79e4..1823514ad7705001656591dbc88f11c98e4ab94b 100644
--- a/ui/app_list/views/search_result_tile_item_view.cc
+++ b/ui/app_list/views/search_result_tile_item_view.cc
@@ -26,6 +26,10 @@ SearchResultTileItemView::~SearchResultTileItemView() {
 }
 
 void SearchResultTileItemView::SetSearchResult(SearchResult* item) {
+  // Handle the case where this may be called from a nested run loop while its
+  // context menu is showing. This cancels the menu (it's for the old item).
+  context_menu_runner_.reset();
+
   SetVisible(item != NULL);
 
   SearchResult* old_item = item_;