Cleanup TranslateRankerLogging experiment.

components/translate/core/browser/translate_ranker_impl.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_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_IMPL_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_IMPL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 22 matching lines @@
 }  // namespace metrics
 
 namespace translate {
 
 class TranslatePrefs;
 
 // Features used to enable ranker query, enforcement and logging. Note that
 // enabling enforcement implies (forces) enabling queries.
 extern const base::Feature kTranslateRankerQuery;
 extern const base::Feature kTranslateRankerEnforcement;
-extern const base::Feature kTranslateRankerLogging;
 extern const base::Feature kTranslateRankerDecisionOverride;
 
 struct TranslateRankerFeatures {
   TranslateRankerFeatures();
 
   TranslateRankerFeatures(int accepted,
                           int denied,
                           int ignored,
                           const std::string& src,
                           const std::string& dst,
@@ skipping 35 matching lines @@
   ~TranslateRankerImpl() override;
 
   // Get the file path of the translate ranker model, by default with a fixed
   // name within |data_dir|.
   static base::FilePath GetModelPath(const base::FilePath& data_dir);
 
   // Get the URL from which the download the translate ranker model, by default
   // from Finch.
   static GURL GetModelURL();
 
-  // Over-ride the default enabled/disabled state of translate event logging.
+  // Override the default enabled/disabled state of translate event logging.
   void EnableLogging(bool value);
 
   // TranslateRanker...
   uint32_t GetModelVersion() const override;
   bool ShouldOfferTranslation(
       const TranslatePrefs& translate_prefs,
       const std::string& src_lang,
       const std::string& dst_lang,
       metrics::TranslateEventProto* translate_event) override;
   void FlushTranslateEvents(
@@ skipping 60 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TranslateRankerImpl);
 };
 
 }  // namespace translate
 
 std::ostream& operator<<(std::ostream& stream,
                          const translate::TranslateRankerFeatures& features);
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_IMPL_H_