Refactor how net/data/verify_certificate_chain_unittest/*

net/data/verify_certificate_chain_unittest/generate-non-self-signed-root.py

-#!/usr/bin/python
-# Copyright (c) 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Certificate chain with 1 intermediate and a trusted root. The trusted root
-is NOT self signed, however its issuer is not included in the chain or root
-store. Verification is expected to succeed since the root is trusted."""
-
-import common
-
-shadow_root = common.create_self_signed_root_certificate('ShadowRoot')
-
-# Non-self-signed root (part of trust store).
-root = common.create_intermediate_certificate('Root', shadow_root)
-
-# Intermediate certificate.
-intermediate = common.create_intermediate_certificate('Intermediate', root)
-
-# Target certificate.
-target = common.create_end_entity_certificate('Target', intermediate)
-
-chain = [target, intermediate]
-trusted = common.TrustAnchor(root, constrained=False)
-time = common.DEFAULT_TIME
-key_purpose = common.DEFAULT_KEY_PURPOSE
-verify_result = True
-errors = None
-
-common.write_test_file(__doc__, chain, trusted, time, key_purpose,
-                       verify_result, errors)