Deactivate and clear search box when closing launcher.

Bug: 1004922
Change-Id: I0662c2010e0914f46be0a9f1ae4ed9e711adc3db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810842Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697797}

ash/app_list/app_list_controller_impl.cc

@@ -1230,8 +1230,9 @@ void AppListControllerImpl::RemoveObserver(
 void AppListControllerImpl::NotifyAppListVisibilityChanged(bool visible,
                                                            int64_t display_id) {
   if (!visible) {
-    presenter_.GetView()->search_box_view()->SetSearchBoxActive(false,
-                                                                ui::ET_UNKNOWN);
+    presenter_.GetView()
+        ->search_box_view()
+        ->ClearSearchAndDeactivateSearchBox();
   }
 
   // Notify chrome of visibility changes.