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

components/ntp_snippets/remote/ntp_snippets_fetcher.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_REMOTE_NTP_SNIPPETS_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_
 
 #include <memory>
 #include <queue>
 #include <set>
@@ skipping 120 matching lines @@
 
     // If set, only return results for this category.
     base::Optional<Category> exclusive_category;
   };
 
   NTPSnippetsFetcher(
       SigninManagerBase* signin_manager,
       OAuth2TokenService* token_service,
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
       PrefService* pref_service,
-      CategoryFactory* category_factory,
       translate::LanguageModel* language_model,
       const ParseJSONCallback& parse_json_callback,
       const std::string& api_key,
       const UserClassifier* user_classifier);
   ~NTPSnippetsFetcher() override;
 
   // Initiates a fetch from the server. When done (successfully or not), calls
   // the subscriber of SetCallback().
   //
   // If an ongoing fetch exists, it will be silently abandoned and a new one
@@ skipping 169 matching lines @@
   // When a token request gets canceled, we want to retry once.
   bool oauth_token_retried_ = false;
 
   // Holds the URL request context.
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   // Stores requests that wait for an access token.
   std::queue<std::pair<RequestBuilder, SnippetsAvailableCallback>>
       pending_requests_;
 
-  // Weak references, not owned.
-  CategoryFactory* const category_factory_;
+  // Weak reference, not owned.
   translate::LanguageModel* const language_model_;
 
   const ParseJSONCallback parse_json_callback_;
 
   // API endpoint for fetching snippets.
   const GURL fetch_url_;
   // Which API to use
   const FetchAPI fetch_api_;
 
   // API key to use for non-authenticated requests.
@@ skipping 17 matching lines @@
   std::string last_status_;
   std::string last_fetch_json_;
 
   base::WeakPtrFactory<NTPSnippetsFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsFetcher);
 };
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_