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

components/translate/core/browser/ranker_model.cc

-// 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.
-
-#include "components/translate/core/browser/ranker_model.h"
-
-#include "base/memory/ptr_util.h"
-#include "base/time/time.h"
-#include "components/translate/core/browser/proto/ranker_model.pb.h"
-
-namespace chrome_intelligence {
-
-RankerModel::RankerModel() : proto_(base::MakeUnique<RankerModelProto>()) {}
-
-RankerModel::~RankerModel() {}
-
-// static
-std::unique_ptr<RankerModel> RankerModel::FromString(const std::string& data) {
-  auto model = base::MakeUnique<RankerModel>();
-  if (!model->mutable_proto()->ParseFromString(data))
-    return nullptr;
-  return model;
-}
-
-bool RankerModel::IsExpired() const {
-  if (!proto().has_metadata())
-    return true;
-
-  const auto& metadata = proto().metadata();
-
-  // If the age of the model cannot be determined, presume it to be expired.
-  if (!metadata.has_last_modified_sec())
-    return true;
-
-  // If the model has no set cache duration, then it never expires.
-  if (!metadata.has_cache_duration_sec() || metadata.cache_duration_sec() == 0)
-    return false;
-
-  // Otherwise, a model is expired if its age exceeds the cache duration.
-  base::Time last_modified =
-      base::Time() + base::TimeDelta::FromSeconds(metadata.last_modified_sec());
-  base::TimeDelta age = base::Time::Now() - last_modified;
-  return age > base::TimeDelta::FromSeconds(metadata.cache_duration_sec());
-}
-
-const std::string& RankerModel::GetSourceURL() const {
-  return proto_->metadata().source();
-}
-
-std::string RankerModel::SerializeAsString() const {
-  return proto_->SerializeAsString();
-}
-
-}  // namespace chrome_intelligence