Test that LoginDatabase preserves PasswordForm::Scheme through migration

components/test/data/password_manager/login_db_v3.sql

Index: components/test/data/password_manager/login_db_v3.sql
diff --git a/components/test/data/password_manager/login_db_v3.sql b/components/test/data/password_manager/login_db_v3.sql
index 68d18d9de4bcb6abdd03e573c716abbf8f9b6920..88474ec83ea1f77fea474cd38881debb234c935c 100644
--- a/components/test/data/password_manager/login_db_v3.sql
+++ b/components/test/data/password_manager/login_db_v3.sql
@@ -57,6 +57,24 @@ X'', /* password_value */
 X'00000000', /* possible_usernames */
 1 /* times_used */
 );
+INSERT INTO "logins" VALUES(
+'http://example.com', /* origin_url */
+'http://example.com/landing', /* action_url */
+'', /* username_element */
+'user', /* username_value */
+'', /* password_element */
+X'', /* password_value */
+'', /* submit_element */
+'http://example.com', /* signon_realm */
+1, /* ssl_valid */
+1, /* preferred */
+1402950000, /* date_created */
+0, /* blacklisted_by_user */
+1, /* scheme */
+0, /* password_type */
+X'00000000', /* possible_usernames */
+1 /* times_used */
+);
 CREATE INDEX logins_signon ON logins (signon_realm);
 COMMIT;