Revert of Pref service: add support for tracked prefs.

chrome/browser/prefs/chrome_pref_service_factory.h

Index: chrome/browser/prefs/chrome_pref_service_factory.h
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.h b/chrome/browser/prefs/chrome_pref_service_factory.h
index e2d53cf0611e712df8a86ba8d3e08663ed5b38ab..48c29eb6e88fc9ed042c9e320f57bb365df40a95 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.h
+++ b/chrome/browser/prefs/chrome_pref_service_factory.h
@@ -8,7 +8,6 @@
 #include <memory>
 
 #include "base/memory/ref_counted.h"
-#include "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom.h"
 
 namespace base {
 class DictionaryValue;
@@ -19,6 +18,12 @@
 
 namespace policy {
 class PolicyService;
+}
+
+namespace prefs {
+namespace mojom {
+class TrackedPreferenceValidationDelegate;
+}
 }
 
 namespace service_manager {
@@ -39,6 +44,7 @@
 class PrefStore;
 class Profile;
 class SupervisedUserSettingsService;
+class TrackedPreferenceValidationDelegate;
 
 namespace chrome_prefs {
 
@@ -76,7 +82,8 @@
 
 std::unique_ptr<sync_preferences::PrefServiceSyncable> CreateProfilePrefs(
     const base::FilePath& pref_filename,
-    prefs::mojom::TrackedPreferenceValidationDelegatePtr validation_delegate,
+    base::SequencedTaskRunner* pref_io_task_runner,
+    prefs::mojom::TrackedPreferenceValidationDelegate* validation_delegate,
     policy::PolicyService* policy_service,
     SupervisedUserSettingsService* supervised_user_settings,
     const scoped_refptr<PrefStore>& extension_prefs,