Move ranker_model_loader to a new component.

components/ranker/ranker_model_loader.cc

Index: components/ranker/ranker_model_loader.cc
diff --git a/components/translate/core/browser/ranker_model_loader.cc b/components/ranker/ranker_model_loader.cc
similarity index 93%
rename from components/translate/core/browser/ranker_model_loader.cc
rename to components/ranker/ranker_model_loader.cc
index eb8175977c4f284b7204288d514ca2d79e88b13b..777f5f895c3d3eb657c80e06980d07c20e4fc435 100644
--- a/components/translate/core/browser/ranker_model_loader.cc
+++ b/components/ranker/ranker_model_loader.cc
@@ -2,7 +2,7 @@
 // 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_loader.h"
+#include "components/ranker/ranker_model_loader.h"
 
 #include <utility>
 
@@ -20,18 +20,13 @@
 #include "base/task_runner_util.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/threading/sequenced_task_runner_handle.h"
-#include "components/translate/core/browser/proto/ranker_model.pb.h"
-#include "components/translate/core/browser/ranker_model.h"
-#include "components/translate/core/browser/translate_url_fetcher.h"
+#include "components/ranker/proto/ranker_model.pb.h"
+#include "components/ranker/ranker_model.h"
+#include "components/ranker/ranker_url_fetcher.h"
 
-namespace translate {
+namespace ranker {
 namespace {
 
-using chrome_intelligence::RankerModel;
-using chrome_intelligence::RankerModelProto;
-
-constexpr int kUrlFetcherId = 2;
-
 // The minimum duration, in minutes, between download attempts.
 constexpr int kMinRetryDelayMins = 3;
 
@@ -107,7 +102,7 @@ RankerModelLoader::RankerModelLoader(
       model_path_(std::move(model_path)),
       model_url_(std::move(model_url)),
       uma_prefix_(std::move(uma_prefix)),
-      url_fetcher_(base::MakeUnique<TranslateURLFetcher>(kUrlFetcherId)),
+      url_fetcher_(base::MakeUnique<RankerURLFetcher>()),
       weak_ptr_factory_(this) {}
 
 RankerModelLoader::~RankerModelLoader() {
@@ -233,9 +228,7 @@ void RankerModelLoader::StartLoadFromURL() {
   }
 }
 
-void RankerModelLoader::OnURLFetched(int /* id */,
-                                     bool success,
-                                     const std::string& data) {
+void RankerModelLoader::OnURLFetched(bool success, const std::string& data) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
   DCHECK_EQ(state_, LoaderState::LOADING_FROM_URL);
 
@@ -280,8 +273,8 @@ void RankerModelLoader::OnURLFetched(int /* id */,
   on_model_available_cb_.Run(std::move(model));
 }
 
-std::unique_ptr<chrome_intelligence::RankerModel>
-RankerModelLoader::CreateAndValidateModel(const std::string& data) {
+std::unique_ptr<RankerModel> RankerModelLoader::CreateAndValidateModel(
+    const std::string& data) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
   MyScopedHistogramTimer timer(uma_prefix_ + kParsetimerHistogram);
   auto model = RankerModel::FromString(data);
@@ -306,4 +299,4 @@ RankerModelStatus RankerModelLoader::ReportModelStatus(
   return model_status;
 }
 
-}  // namespace translate
+}  // namespace ranker