Fix the Crash in the launcher's start page on Chrome OS.

ui/app_list/views/start_page_view.cc

Index: ui/app_list/views/start_page_view.cc
diff --git a/ui/app_list/views/start_page_view.cc b/ui/app_list/views/start_page_view.cc
index 0bac15b7b2ab6f8edd0963a7683af447347acb52..8df6a7a3d0ba7ed94ab74f39f54d75190fb7a4c6 100644
--- a/ui/app_list/views/start_page_view.cc
+++ b/ui/app_list/views/start_page_view.cc
@@ -190,7 +190,7 @@ int StartPageView::StartPageTilesContainer::Update() {
       delete search_result_tile_views_[i];
     search_result_tile_views_.clear();
     RemoveChildView(all_apps_button_);
-    CreateAppsGrid(std::min(kNumStartPageTiles, display_results.size()));
+    CreateAppsGrid(display_results.size());
   }
 
   // Update the tile item results.
@@ -211,10 +211,10 @@ int StartPageView::StartPageTilesContainer::Update() {
 void StartPageView::StartPageTilesContainer::UpdateSelectedIndex(
     int old_selected,
     int new_selected) {
-  if (old_selected >= 0)
+  if (old_selected >= 0 && old_selected < num_results())
     GetTileItemView(old_selected)->SetSelected(false);
 
-  if (new_selected >= 0)
+  if (new_selected >= 0 && new_selected < num_results())
     GetTileItemView(new_selected)->SetSelected(true);
 }
 
@@ -360,8 +360,8 @@ void StartPageView::OnShown() {
     custom_page_view->SetVisible(
         app_list_main_view_->ShouldShowCustomLauncherPage());
   }
-  tiles_container_->Update();
   tiles_container_->ClearSelectedIndex();
+  tiles_container_->set_num_results(tiles_container_->Update());
   custom_launcher_page_background_->SetSelected(false);
 }