Fix app list item indexing bug.

ui/app_list/test/app_list_test_view_delegate.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 13 matching lines @@
 class AppListTestModel;
 
 // A concrete AppListViewDelegate for unit tests.
 class AppListTestViewDelegate : public AppListViewDelegate {
  public:
   AppListTestViewDelegate();
   ~AppListTestViewDelegate() override;
 
   int dismiss_count() { return dismiss_count_; }
   int open_search_result_count() { return open_search_result_count_; }
-  std::map<size_t, int> open_search_result_counts() {
+  std::map<size_t, int>& open_search_result_counts() {
     return open_search_result_counts_;
   }
 
   // Sets the number of apps that the model will be created with the next time
   // SetProfileByPath() is called.
   void set_next_profile_app_count(int apps) { next_profile_app_count_ = apps; }
 
   void set_auto_launch_timeout(const base::TimeDelta& timeout) {
     auto_launch_timeout_ = timeout;
   }
@@ skipping 43 matching lines @@
   SpeechUIModel speech_ui_;
   base::TimeDelta auto_launch_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListTestViewDelegate);
 };
 
 }  // namespace test
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_