[NTP Snippets] Refactor background scheduling for remote suggestions

components/ntp_snippets/content_suggestions_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 "components/ntp_snippets/content_suggestions_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 #include <utility>
@@ skipping 11 matching lines @@
 namespace ntp_snippets {
 
 ContentSuggestionsService::ContentSuggestionsService(
     State state,
     SigninManagerBase* signin_manager,
     history::HistoryService* history_service,
     PrefService* pref_service)
     : state_(state),
       signin_observer_(this),
       history_service_observer_(this),
-      ntp_snippets_service_(nullptr),
+      remote_suggestions_provider_(nullptr),
       pref_service_(pref_service),
       user_classifier_(pref_service) {
   // Can be null in tests.
   if (signin_manager) {
     signin_observer_.Add(signin_manager);
   }
 
   if (history_service) {
     history_service_observer_.Add(history_service);
   }
 
   RestoreDismissedCategoriesFromPrefs();
 }
 
 ContentSuggestionsService::~ContentSuggestionsService() = default;
 
 void ContentSuggestionsService::Shutdown() {
-  ntp_snippets_service_ = nullptr;
+  remote_suggestions_provider_ = nullptr;
   suggestions_by_category_.clear();
   providers_by_category_.clear();
   categories_.clear();
   providers_.clear();
   state_ = State::DISABLED;
   for (Observer& observer : observers_) {
     observer.ContentSuggestionsServiceShutdown();
   }
 }
 
@@ skipping 434 matching lines @@
 void ContentSuggestionsService::StoreDismissedCategoriesToPrefs() {
   base::ListValue list;
   for (const auto& category_provider_pair : dismissed_providers_by_category_) {
     list.AppendInteger(category_provider_pair.first.id());
   }
 
   pref_service_->Set(prefs::kDismissedCategories, list);
 }
 
 }  // namespace ntp_snippets