Fix app list item indexing bug.

ui/app_list/app_list_features.cc

 // Copyright 2017 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.
 
 #include "ui/app_list/app_list_features.h"
 
 #include "base/feature_list.h"
 #include "base/metrics/field_trial_params.h"
 #include "ui/app_list/app_list_switches.h"
 
@@ skipping 25 matching lines @@
   return switches::IsFullscreenAppListEnabled() ||
          base::FeatureList::IsEnabled(kEnableFullscreenAppList);
 }
 
 bool IsSearchResultsNewDesignEnabled() {
   return IsFullscreenAppListEnabled() ||
          (IsAnswerCardEnabled() && !IsAnswerCardDarkRunEnabled());
 }
 
 bool IsPlayStoreAppSearchEnabled() {
-  static const bool enabled =
-      base::FeatureList::IsEnabled(kEnablePlayStoreAppSearch);
-  return enabled;
+  // Not using local static variable to allow tests to change this value.
+  return base::FeatureList::IsEnabled(kEnablePlayStoreAppSearch);
 }
 
 int AnswerCardMaxWidth() {
   static const int max_width = base::GetFieldTrialParamByFeatureAsInt(
       kEnableAnswerCard, "CardMaxWidth", 608);
   return max_width;
 }
 
 int AnswerCardMaxHeight() {
   static const int max_height = base::GetFieldTrialParamByFeatureAsInt(
       kEnableAnswerCard, "CardMaxHeight", 266);
   return max_height;
 }
 
 std::string AnswerServerUrl() {
   return base::GetFieldTrialParamValueByFeature(kEnableAnswerCard, "ServerUrl");
 }
 
 }  // namespace features
 }  // namespace app_list