Resurect AppListMainViewTests

BUG=1102648

Change-Id: I0cb455c90f5ee79da2bec11d83a047b75e003029
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292832Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787473}

ash/app_list/test/app_list_test_view_delegate.h

@@ -131,6 +131,8 @@ class AppListTestViewDelegate : public AppListViewDelegate,
   AppListTestModel* ReleaseTestModel() { return model_.release(); }
   AppListTestModel* GetTestModel() { return model_.get(); }
 
+  SearchModel* ReleaseTestSearchModel() { return search_model_.release(); }
+
  private:
   void RecordAppLaunched(ash::AppListLaunchedFrom launched_from);