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

ios/chrome/browser/translate/translate_ranker_factory.h

-// Copyright 2014 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 IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_FACTORY_H_
-#define IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_FACTORY_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
-
-namespace base {
-template <typename T>
-struct DefaultSingletonTraits;
-}
-
-namespace ios {
-class ChromeBrowserState;
-}
-
-namespace translate {
-
-class TranslateRanker;
-
-// TranslateRankerFactory is a way to associate a TranslateRanker instance to
-// a BrowserState.
-class TranslateRankerFactory : public BrowserStateKeyedServiceFactory {
- public:
-  static translate::TranslateRanker* GetForBrowserState(
-      ios::ChromeBrowserState* browser_state);
-  static TranslateRankerFactory* GetInstance();
-
- private:
-  friend struct base::DefaultSingletonTraits<TranslateRankerFactory>;
-
-  TranslateRankerFactory();
-  ~TranslateRankerFactory() override;
-
-  // BrowserStateKeyedServiceFactory implementation.
-  std::unique_ptr<KeyedService> BuildServiceInstanceFor(
-      web::BrowserState* context) const override;
-  web::BrowserState* GetBrowserStateToUse(
-      web::BrowserState* context) const override;
-
-  DISALLOW_COPY_AND_ASSIGN(TranslateRankerFactory);
-};
-
-}  // namespace translate
-
-#endif  // IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_RANKER_FACTORY_H_