Add a mojo bridge for PersistentPrefStore.

chrome/browser/prefs/profile_pref_store_manager.h

Index: chrome/browser/prefs/profile_pref_store_manager.h
diff --git a/chrome/browser/prefs/profile_pref_store_manager.h b/chrome/browser/prefs/profile_pref_store_manager.h
index c79ef0b012208d333caecad642f4c34eccb0803e..42cddc540d1b5b07490e38bd14e959e89d1295a7 100644
--- a/chrome/browser/prefs/profile_pref_store_manager.h
+++ b/chrome/browser/prefs/profile_pref_store_manager.h
@@ -15,6 +15,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/user_prefs/tracked/pref_hash_filter.h"
+#include "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom.h"
 
 class HashStoreContents;
 class PersistentPrefStore;
@@ -24,6 +25,7 @@ class PrefService;
 namespace base {
 class DictionaryValue;
 class SequencedTaskRunner;
+class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace prefs {
@@ -89,9 +91,11 @@ class ProfilePrefStoreManager {
   // An optional |validation_delegate| will be notified
   // of the status of each tracked preference as they are checked.
   PersistentPrefStore* CreateProfilePrefStore(
+      const scoped_refptr<base::SingleThreadTaskRunner>& pref_task_runner,
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
       const base::Closure& on_reset_on_load,
-      prefs::mojom::TrackedPreferenceValidationDelegate* validation_delegate);
+      std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>*
+          validation_delegate);
 
   // Initializes the preferences for the managed profile with the preference
   // values in |master_prefs|. Acts synchronously, including blocking IO.