[NTP::SectionOrder] Replace CategoryFactory with a category ranker.

components/ntp_snippets/sessions/foreign_sessions_suggestions_provider.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_SESSIONS_FOREIGN_SESSIONS_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_SESSIONS_FOREIGN_SESSIONS_SUGGESTIONS_PROVIDER_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 22 matching lines @@
   // Should only be called at most once.
   virtual void SubscribeForForeignTabChange(
       const base::Closure& change_callback) = 0;
 };
 
 // Provides content suggestions from foreign sessions.
 class ForeignSessionsSuggestionsProvider : public ContentSuggestionsProvider {
  public:
   ForeignSessionsSuggestionsProvider(
       ContentSuggestionsProvider::Observer* observer,
-      CategoryFactory* category_factory,
       std::unique_ptr<ForeignSessionsProvider> foreign_sessions_provider,
       PrefService* pref_service);
   ~ForeignSessionsSuggestionsProvider() override;
 
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
  private:
   friend class ForeignSessionsSuggestionsProviderTest;
   struct SessionData;
 
@@ skipping 26 matching lines @@
   const Category provided_category_;
   std::unique_ptr<ForeignSessionsProvider> foreign_sessions_provider_;
   PrefService* pref_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ForeignSessionsSuggestionsProvider);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_SESSIONS_FOREIGN_SESSIONS_SUGGESTIONS_PROVIDER_H_