Integrate RankerModelLoader with TranslateRanker.

components/translate/core/browser/BUILD.gn

Index: components/translate/core/browser/BUILD.gn
diff --git a/components/translate/core/browser/BUILD.gn b/components/translate/core/browser/BUILD.gn
index 01d219863f5b0e1168d0449d1146becd4b19d682..30bb6fbb2f4de22eb1be3b161d923486e17fbdd1 100644
--- a/components/translate/core/browser/BUILD.gn
+++ b/components/translate/core/browser/BUILD.gn
@@ -34,10 +34,9 @@ static_library("browser") {
     "translate_manager.h",
     "translate_prefs.cc",
     "translate_prefs.h",
-    "translate_ranker.cc",
     "translate_ranker.h",
-    "translate_ranker_metrics_provider.cc",
-    "translate_ranker_metrics_provider.h",
+    "translate_ranker_impl.cc",
+    "translate_ranker_impl.h",
     "translate_script.cc",
     "translate_script.h",
     "translate_step.h",
@@ -94,13 +93,15 @@ source_set("unit_tests") {
     "language_state_unittest.cc",
     "mock_translate_driver.cc",
     "mock_translate_driver.h",
+    "mock_translate_ranker.cc",
+    "mock_translate_ranker.h",
     "ranker_model_loader_unittest.cc",
     "ranker_model_unittest.cc",
     "translate_browser_metrics_unittest.cc",
     "translate_language_list_unittest.cc",
     "translate_manager_unittest.cc",
     "translate_prefs_unittest.cc",
-    "translate_ranker_unittest.cc",
+    "translate_ranker_impl_unittest.cc",
     "translate_script_unittest.cc",
     "translate_ui_delegate_unittest.cc",
   ]