[Sync] Fix favicon updates to handle orphan nodes

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 363fa819986ba4e55f90c71bf4fd95cf38f00232..97d03bada5b1c22830d4abe0c48a18edf1d5c0ce 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -122,6 +122,8 @@ class NudgeStrategy {
        return ACCOMPANY_ONLY;
      case PREFERENCES:
      case SESSIONS:
+     case FAVICON_IMAGES:
+     case FAVICON_TRACKING:
        return CUSTOM;
      default:
        return IMMEDIATE;
@@ -149,6 +151,8 @@ class NudgeStrategy {
                kPreferencesNudgeDelayMilliseconds);
            break;
          case SESSIONS:
+         case FAVICON_IMAGES:
+         case FAVICON_TRACKING:
            delay = core->scheduler()->GetSessionsCommitDelay();
            break;
          default: