[sync] Fix IsSyncConfirmationNeeded crash when local backend is enabled

components/browser_sync/profile_sync_service_startup_unittest.cc

Index: components/browser_sync/profile_sync_service_startup_unittest.cc
diff --git a/components/browser_sync/profile_sync_service_startup_unittest.cc b/components/browser_sync/profile_sync_service_startup_unittest.cc
index 9d3e951e6d111f2b4d6345fdb65c460e31b6d2d6..34213e253c91e4cccba76d1f7a59012946c397a2 100644
--- a/components/browser_sync/profile_sync_service_startup_unittest.cc
+++ b/components/browser_sync/profile_sync_service_startup_unittest.cc
@@ -195,6 +195,9 @@ TEST_F(ProfileSyncServiceStartupTest, StartFirstTime) {
 
   auto sync_blocker = sync_service_->GetSetupInProgressHandle();
 
+  // Confirmation isn't needed before sign in occurs.
+  EXPECT_FALSE(sync_service_->IsSyncConfirmationNeeded());
+
   // Simulate successful signin as test_user.
   std::string account_id = SimulateTestUserSignin(sync_service_.get());
   ON_CALL(*data_type_manager, IsNigoriEnabled()).WillByDefault(Return(true));