Revert of Pref service: add support for tracked prefs.

services/preferences/persistent_pref_store_factory.cc

Index: services/preferences/persistent_pref_store_factory.cc
diff --git a/services/preferences/persistent_pref_store_factory.cc b/services/preferences/persistent_pref_store_factory.cc
index 587ac96d1828ed0ee3995e1f8cb911f595f94c70..ef63057bcc19eb1569e14c1e73906d72d18ee0b2 100644
--- a/services/preferences/persistent_pref_store_factory.cc
+++ b/services/preferences/persistent_pref_store_factory.cc
@@ -10,7 +10,6 @@
 #include "components/prefs/json_pref_store.h"
 #include "components/prefs/pref_filter.h"
 #include "services/preferences/persistent_pref_store_impl.h"
-#include "services/preferences/tracked/tracked_persistent_pref_store_factory.h"
 
 namespace prefs {
 namespace {
@@ -24,7 +23,7 @@
                         JsonPrefStore::GetTaskRunnerForFile(
                             config->pref_filename.DirName(), worker_pool),
                         nullptr),
-      std::move(on_initialized));
+      nullptr, std::move(on_initialized));
 }
 
 }  // namespace
@@ -38,12 +37,6 @@
         std::move(configuration->get_simple_configuration()), worker_pool,
         std::move(on_initialized));
   }
-  if (configuration->is_tracked_configuration()) {
-    return base::MakeUnique<PersistentPrefStoreImpl>(
-        CreateTrackedPersistentPrefStore(
-            std::move(configuration->get_tracked_configuration()), worker_pool),
-        std::move(on_initialized));
-  }
   NOTREACHED();
   return nullptr;
 }