Cleanup: Remove CategoryStatus::SIGNED_OUT

chrome/browser/android/ntp/content_suggestions_notifier_service.cc

 // Copyright 2016 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 "chrome/browser/android/ntp/content_suggestions_notifier_service.h"
 
 #include <algorithm>
 
 #include "base/android/application_status_listener.h"
 #include "base/memory/ptr_util.h"
@@ skipping 134 matching lines @@
                    use_snippet ? suggestion->snippet_text()
                                : suggestion->publisher_name(),
                    timeout_at));
   }
 
   void OnCategoryStatusChanged(Category category,
                                CategoryStatus new_status) override {
     if (!category.IsKnownCategory(KnownCategories::ARTICLES)) {
       return;
     }
-    switch (new_status) {
-      case CategoryStatus::AVAILABLE:
-      case CategoryStatus::AVAILABLE_LOADING:
-        break;  // nothing to do
-      case CategoryStatus::INITIALIZING:
-      case CategoryStatus::ALL_SUGGESTIONS_EXPLICITLY_DISABLED:
-      case CategoryStatus::CATEGORY_EXPLICITLY_DISABLED:
-      case CategoryStatus::LOADING_ERROR:
-      case CategoryStatus::NOT_PROVIDED:
-      case CategoryStatus::SIGNED_OUT:
-        ContentSuggestionsNotificationHelper::HideAllNotifications(
-            CONTENT_SUGGESTIONS_HIDE_DISABLED);
-        break;
+    if (!ntp_snippets::IsCategoryStatusAvailable(new_status)) {
+      ContentSuggestionsNotificationHelper::HideAllNotifications(
+          CONTENT_SUGGESTIONS_HIDE_DISABLED);
     }
   }
 
   void OnSuggestionInvalidated(
       const ContentSuggestion::ID& suggestion_id) override {
     ContentSuggestionsNotificationHelper::HideNotification(
         suggestion_id, CONTENT_SUGGESTIONS_HIDE_EXPIRY);
   }
 
   void OnFullRefreshRequired() override {
@@ skipping 89 matching lines @@
   registry->RegisterIntegerPref(
       prefs::kContentSuggestionsConsecutiveIgnoredPrefName, 0);
   registry->RegisterIntegerPref(prefs::kContentSuggestionsNotificationsSentDay,
                                 0);
   registry->RegisterIntegerPref(
       prefs::kContentSuggestionsNotificationsSentCount, 0);
 
   // TODO(sfiera): remove after M62; no longer (and never really) used.
   registry->RegisterStringPref(kNotificationIDWithinCategory, std::string());
 }