Revert "[Translate] Add translate ranker model loader."

components/translate/core/browser/translate_ranker_impl.h

Index: components/translate/core/browser/translate_ranker_impl.h
diff --git a/components/translate/core/browser/translate_ranker_impl.h b/components/translate/core/browser/translate_ranker_impl.h
deleted file mode 100644
index a032a52604b430e6ccf20100b9b50111dfac17d4..0000000000000000000000000000000000000000
--- a/components/translate/core/browser/translate_ranker_impl.h
+++ /dev/null
@@ -1,136 +0,0 @@
-// 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>
-
-#include "base/feature_list.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/sequence_checker.h"
-#include "base/sequenced_task_runner.h"
-#include "components/keyed_service/core/keyed_service.h"
-#include "components/translate/core/browser/ranker_model_loader.h"
-#include "components/translate/core/browser/translate_ranker.h"
-#include "url/gurl.h"
-
-namespace chrome_intelligence {
-class RankerModel;
-}  // namespace chrome_intelligence
-
-namespace metrics {
-class TranslateEventProto;
-}  // 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;
-
-struct TranslateRankerFeatures {
-  TranslateRankerFeatures();
-
-  TranslateRankerFeatures(int accepted,
-                          int denied,
-                          int ignored,
-                          const std::string& src,
-                          const std::string& dst,
-                          const std::string& cntry,
-                          const std::string& locale);
-
-  TranslateRankerFeatures(const TranslatePrefs& prefs,
-                          const std::string& src,
-                          const std::string& dst,
-                          const std::string& locale);
-
-  ~TranslateRankerFeatures();
-
-  void WriteTo(std::ostream& stream) const;
-
-  // Input value used to generate the features.
-  int accepted_count;
-  int denied_count;
-  int ignored_count;
-  int total_count;
-
-  // Used for inference.
-  std::string src_lang;
-  std::string dst_lang;
-  std::string country;
-  std::string app_locale;
-  double accepted_ratio;
-  double denied_ratio;
-  double ignored_ratio;
-};
-
-// If enabled, downloads a translate ranker model and uses it to determine
-// whether the user should be given a translation prompt or not.
-class TranslateRankerImpl : public TranslateRanker {
- public:
-  TranslateRankerImpl(const base::FilePath& model_path, const GURL& model_url);
-  ~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();
-
-  // TranslateRanker...
-  bool IsLoggingEnabled() override;
-  bool IsQueryEnabled() override;
-  bool IsEnforcementEnabled() override;
-  int GetModelVersion() const override;
-  bool ShouldOfferTranslation(const TranslatePrefs& translate_prefs,
-                              const std::string& src_lang,
-                              const std::string& dst_lang) override;
-  void AddTranslateEvent(
-      const metrics::TranslateEventProto& translate_event) override;
-  void FlushTranslateEvents(
-      std::vector<metrics::TranslateEventProto>* events) override;
-
-  void OnModelAvailable(
-      std::unique_ptr<chrome_intelligence::RankerModel> model);
-
-  // Calculate the score given to |features| by the |model|.
-  double CalculateScore(const TranslateRankerFeatures& features);
-
-  // Check if the ModelLoader has been initialized. Used to test ModelLoader
-  // logic.
-  bool CheckModelLoaderForTesting();
-
- private:
-  // Used to sanity check the threading of this ranker.
-  base::SequenceChecker sequence_checker_;
-
-  // A helper to load the translate ranker model from disk cache or a URL.
-  std::unique_ptr<RankerModelLoader> model_loader_;
-
-  // The translation ranker model.
-  std::unique_ptr<chrome_intelligence::RankerModel> model_;
-
-  // Saved cache of translate event protos.
-  std::vector<metrics::TranslateEventProto> event_cache_;
-
-  base::WeakPtrFactory<TranslateRankerImpl> weak_ptr_factory_;
-
-  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_