Move ranker_model_loader to a new component.

components/translate/core/browser/ranker_model.h

-// Copyright 2017 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_RANKER_MODEL_H_
-#define COMPONENTS_TRANSLATE_CORE_BROWSER_RANKER_MODEL_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-
-namespace chrome_intelligence {
-
-class RankerModelProto;
-
-// Wrapper class for chrome_intelligence::TranslateRankerProto.
-class RankerModel {
- public:
-  RankerModel();
-  ~RankerModel();
-
-  // Returns a new ranker model constructed from |data|.
-  static std::unique_ptr<RankerModel> FromString(const std::string& data);
-
-  const RankerModelProto& proto() const { return *proto_; }
-  RankerModelProto* mutable_proto() const { return proto_.get(); }
-
-  // Returns true if this ranker model has expired.
-  bool IsExpired() const;
-
-  const std::string& GetSourceURL() const;
-
-  // Returns a serialization of this ranker model.
-  std::string SerializeAsString() const;
-
- private:
-  // The underlying ranker model proto.
-  std::unique_ptr<RankerModelProto> proto_;
-
-  DISALLOW_COPY_AND_ASSIGN(RankerModel);
-};
-
-}  // namesapce chrome_intelligence
-
-#endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_RANKER_MODEL_H_