Revert of Pref service: add support for tracked prefs.

services/preferences/public/interfaces/preferences_configuration.mojom

Index: services/preferences/public/interfaces/preferences_configuration.mojom
diff --git a/services/preferences/public/interfaces/preferences_configuration.mojom b/services/preferences/public/interfaces/preferences_configuration.mojom
index 76f7785ae06a260085906affae6da2a8f2462a5b..d2bd39a88011699517100e74c1b13b3ff20994df 100644
--- a/services/preferences/public/interfaces/preferences_configuration.mojom
+++ b/services/preferences/public/interfaces/preferences_configuration.mojom
@@ -5,31 +5,13 @@
 module prefs.mojom;
 
 import "mojo/common/file_path.mojom";
-import "mojo/common/string16.mojom";
-import "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom";
 
 union PersistentPrefStoreConfiguration {
   SimplePersistentPrefStoreConfiguration simple_configuration;
-  TrackedPersistentPrefStoreConfiguration tracked_configuration;
 };
 
 struct SimplePersistentPrefStoreConfiguration {
   mojo.common.mojom.FilePath pref_filename;
-};
-
-// These parameters are passed to prefs::CreateTrackedPersistentPrefStore() in
-// services/preferences/persistent_pref_store_factory.cc.
-struct TrackedPersistentPrefStoreConfiguration {
-  mojo.common.mojom.FilePath unprotected_pref_filename;
-  mojo.common.mojom.FilePath protected_pref_filename;
-  array<TrackedPreferenceMetadata> tracking_configuration;
-  uint64 reporting_ids_count;
-  string seed;
-  string legacy_device_id;
-  string registry_seed;
-  mojo.common.mojom.String16 registry_path;
-  TrackedPreferenceValidationDelegate? validation_delegate;
-  ResetOnLoadObserver? reset_on_load_observer;
 };
 
 struct TrackedPreferenceMetadata {
@@ -56,7 +38,3 @@
   PrefTrackingStrategy strategy;
   ValueType value_type;
 };
-
-interface ResetOnLoadObserver {
-  OnResetOnLoad();
-};