Pref service: enable for user prefs in chrome behind a flag.

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 4e32201a5ec94451be34ea3b8b2771a29a447cd5..52253cf250989a2d846ee09bd10c510da09b7bb6 100644
--- a/chrome/browser/prefs/profile_pref_store_manager.h
+++ b/chrome/browser/prefs/profile_pref_store_manager.h
@@ -32,6 +32,10 @@ class TrackedPreferenceValidationDelegate;
 }
 }
 
+namespace service_manager {
+class Connector;
+}
+
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
@@ -91,7 +95,9 @@ class ProfilePrefStoreManager {
   PersistentPrefStore* CreateProfilePrefStore(
       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,
+      service_manager::Connector* connector);
 
   // Initializes the preferences for the managed profile with the preference
   // values in |master_prefs|. Acts synchronously, including blocking IO.
@@ -115,6 +121,13 @@ class ProfilePrefStoreManager {
   std::pair<std::unique_ptr<PrefHashStore>, std::unique_ptr<HashStoreContents>>
   GetExternalVerificationPrefHashStorePair();
 
+  // Connects to the pref service over mojo and configures it.
+  void ConfigurePrefService(
+      const base::Closure& on_reset_on_load,
+      std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>
+          validation_delegate,
+      service_manager::Connector* connector);
+
   const base::FilePath profile_path_;
   const std::vector<PrefHashFilter::TrackedPreferenceMetadata>
       tracking_configuration_;