[NTP Snippets] Hook up background fetching scheduler to UserClassifier

components/ntp_snippets/content_suggestions_service.h

 // 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.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 #define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 163 matching lines @@
 
   CategoryFactory* category_factory() { return &category_factory_; }
 
   // The reference to the NTPSnippetsService provider should only be set by the
   // factory and only be used for scheduling, periodic fetching and debugging.
   NTPSnippetsService* ntp_snippets_service() { return ntp_snippets_service_; }
   void set_ntp_snippets_service(NTPSnippetsService* ntp_snippets_service) {
     ntp_snippets_service_ = ntp_snippets_service;
   }
 
-  UserClassifier* user_classifier() { return &user_classifier_;}
+  UserClassifier* user_classifier() { return &user_classifier_; }
 
  private:
   friend class ContentSuggestionsServiceTest;
 
   // Implementation of ContentSuggestionsProvider::Observer.
   void OnNewSuggestions(ContentSuggestionsProvider* provider,
                         Category category,
                         std::vector<ContentSuggestion> suggestions) override;
   void OnCategoryStatusChanged(ContentSuggestionsProvider* provider,
                                Category category,
@@ skipping 69 matching lines @@
   NTPSnippetsService* ntp_snippets_service_;
 
   UserClassifier user_classifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSuggestionsService);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_