[Sync] Allow sync start without sign-in if the local sync backend is on.

components/browsing_data/core/history_notice_utils_unittest.cc

Index: components/browsing_data/core/history_notice_utils_unittest.cc
diff --git a/components/browsing_data/core/history_notice_utils_unittest.cc b/components/browsing_data/core/history_notice_utils_unittest.cc
index 6c4363c02d1b5353b809a767c235f086512fa7f0..2701c85ed777a55e58d2c5814df4cb76e12565ee 100644
--- a/components/browsing_data/core/history_notice_utils_unittest.cc
+++ b/components/browsing_data/core/history_notice_utils_unittest.cc
@@ -28,9 +28,9 @@ namespace {
 class TestSyncService : public syncer::FakeSyncService {
  public:
   // Getters (FakeSyncService implementation). ---------------------------------
-  bool IsSyncActive() const override {
-   return sync_active_;
-  }
+  bool IsSyncActive() const override { return sync_active_; }
+
+  bool IsLocalSyncEnabled() const override { return false; }
 
   syncer::ModelTypeSet GetActiveDataTypes() const override {
     return active_data_types_;