Revert of Make extensions DSE persistent in browser prefs

components/search_engines/template_url_prepopulate_data.cc

Index: components/search_engines/template_url_prepopulate_data.cc
diff --git a/components/search_engines/template_url_prepopulate_data.cc b/components/search_engines/template_url_prepopulate_data.cc
index 38301ce6a64f3dbf6db1452a827bc7d8a26a325e..56d76a6829ab2a3e72169fe828020b6626cd5cb1 100644
--- a/components/search_engines/template_url_prepopulate_data.cc
+++ b/components/search_engines/template_url_prepopulate_data.cc
@@ -1041,18 +1041,6 @@
   return GetPrepopulationSetFromCountryID(GetCountryIDFromPrefs(prefs));
 }
 
-std::unique_ptr<TemplateURLData> GetPrepopulatedEngine(PrefService* prefs,
-                                                       int prepopulated_id) {
-  size_t default_index;
-  auto engines =
-      TemplateURLPrepopulateData::GetPrepopulatedEngines(prefs, &default_index);
-  for (auto& engine : engines) {
-    if (engine->prepopulate_id == prepopulated_id)
-      return std::move(engine);
-  }
-  return nullptr;
-}
-
 #if defined(OS_ANDROID)
 
 std::vector<std::unique_ptr<TemplateURLData>> GetLocalPrepopulatedEngines(