Move ranker_model_loader to a new component.

components/ranker/ranker_model_loader.h

Index: components/ranker/ranker_model_loader.h
diff --git a/components/translate/core/browser/ranker_model_loader.h b/components/ranker/ranker_model_loader.h
similarity index 86%
rename from components/translate/core/browser/ranker_model_loader.h
rename to components/ranker/ranker_model_loader.h
index 68445b74ecd8a13547d1a324f60409e44385bbe9..484662918ead1f8120e36b503a41e4d33bfb6e5a 100644
--- a/components/translate/core/browser/ranker_model_loader.h
+++ b/components/ranker/ranker_model_loader.h
@@ -2,8 +2,8 @@
 // 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_LOADER_H_
-#define COMPONENTS_TRANSLATE_CORE_BROWSER_RANKER_MODEL_LOADER_H_
+#ifndef COMPONENTS_RANKER_RANKER_MODEL_LOADER_H_
+#define COMPONENTS_RANKER_RANKER_MODEL_LOADER_H_
 
 #include <memory>
 #include <string>
@@ -20,13 +20,10 @@ namespace base {
 class SequencedTaskRunner;
 }  // namespace base
 
-namespace chrome_intelligence {
-class RankerModel;
-}  // namespace chrome_intelligence
-
-namespace translate {
+namespace ranker {
 
-class TranslateURLFetcher;
+class RankerURLFetcher;
+class RankerModel;
 
 // Enumeration denoting the outcome of an attempt to download the model. This
 // must be kept in sync with the RankerModelStatus enum in histograms.xml
@@ -44,22 +41,23 @@ enum class RankerModelStatus {
   MAX
 };
 
-// If enabled, downloads a translate ranker model and uses it to determine
-// whether the user should be given a translation prompt or not.
+// FIXME update comments.
+
+// If enabled, downloads a ranker model.
 class RankerModelLoader {
  public:
   // Callback to validate a ranker model on behalf of the model loader client.
   // For example, the callback might validate that the model is compatible with
   // the features generated when ranking translation offerings.  This will be
   // called on the sequence on which the model loader was constructed.
-  using ValidateModelCallback = base::RepeatingCallback<RankerModelStatus(
-      const chrome_intelligence::RankerModel&)>;
+  using ValidateModelCallback =
+      base::RepeatingCallback<RankerModelStatus(const ranker::RankerModel&)>;
 
   // Called to transfer ownership of a loaded model back to the model loader
   // client. This will be called on the sequence on which the model loader was
   // constructed.
-  using OnModelAvailableCallback = base::RepeatingCallback<void(
-      std::unique_ptr<chrome_intelligence::RankerModel>)>;
+  using OnModelAvailableCallback =
+      base::RepeatingCallback<void(std::unique_ptr<ranker::RankerModel>)>;
 
   // |validate_model_callback| may be called on any sequence; it must be thread
   // safe.
@@ -130,15 +128,14 @@ class RankerModelLoader {
 
   // Called when |url_fetcher_| has finished loading |data| from |model_url_|.
   //
-  // This call signature is mandated by TranslateURLFetcher.
+  // This call signature is mandated by RankerURLFetcher.
   //
-  // id - the id given to the TranslateURLFetcher on creation
   // success - true of the download was successful
   // data - the body of the downloads response
-  void OnURLFetched(int id, bool success, const std::string& data);
+  void OnURLFetched(bool success, const std::string& data);
 
   // Parse |data| and return a validated model. Returns nullptr on failure.
-  std::unique_ptr<chrome_intelligence::RankerModel> CreateAndValidateModel(
+  std::unique_ptr<ranker::RankerModel> CreateAndValidateModel(
       const std::string& data);
 
   // Helper function to log |model_status| to UMA and return it.
@@ -171,7 +168,7 @@ class RankerModelLoader {
   const std::string uma_prefix_;
 
   // Used to download model data from |model_url_|.
-  std::unique_ptr<TranslateURLFetcher> url_fetcher_;
+  std::unique_ptr<RankerURLFetcher> url_fetcher_;
 
   // The next time before which no new attempts to download the model should be
   // attempted.
@@ -190,6 +187,6 @@ class RankerModelLoader {
   DISALLOW_COPY_AND_ASSIGN(RankerModelLoader);
 };
 
-}  // namespace translate
+}  // namespace ranker
 
-#endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_RANKER_MODEL_LOADER_H_
+#endif  // COMPONENTS_RANKER_RANKER_MODEL_LOADER_H_