Fix a DCHECK in HttpPasswordStoreMigrator for localhost.

components/password_manager/content/browser/credential_manager_impl_unittest.cc

Index: components/password_manager/content/browser/credential_manager_impl_unittest.cc
diff --git a/components/password_manager/content/browser/credential_manager_impl_unittest.cc b/components/password_manager/content/browser/credential_manager_impl_unittest.cc
index 4032c5227fec4a613add5a87f825e19488a2358b..9563fc28c69add8b0a0376b41162f8824a27c484 100644
--- a/components/password_manager/content/browser/credential_manager_impl_unittest.cc
+++ b/components/password_manager/content/browser/credential_manager_impl_unittest.cc
@@ -1468,6 +1468,14 @@ TEST_F(CredentialManagerImplTest, ZeroClickAfterMigratingHttpCredential) {
                                CredentialType::CREDENTIAL_TYPE_PASSWORD);
 }
 
+TEST_F(CredentialManagerImplTest, MigrateWithEmptyStore) {
+  // HTTP scheme is valid for localhost. Nothing should crash.
+  NavigateAndCommit(GURL("http://127.0.0.1:8000/"));
+
+  std::vector<GURL> federations;
+  ExpectZeroClickSignInFailure(false, true, federations);
+}
+
 TEST_F(CredentialManagerImplTest, GetSynthesizedFormForOrigin) {
   PasswordStore::FormDigest synthesized =
       cm_service_impl_->GetSynthesizedFormForOrigin();