Bug 1493683 - [lint] Remove wpt_manifest linter, r=jgraham

This is no longer needed because the manifest update now happens out of tree.
The taskcluster task was already removed, though the actual linter
implementation was forgotten.

Differential Revision: https://phabricator.services.mozilla.com/D9118

--HG--
extra : moz-landing-system : lando

tools/lint/wpt/wpt_manifest.py

@@ -1,15 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-import imp
-import os
-
-
-def lint(files, config, logger, **kwargs):
-    wpt_dir = os.path.join(kwargs["root"], "testing", "web-platform")
-    manifestupdate = imp.load_source("manifestupdate",
-                                     os.path.join(wpt_dir, "manifestupdate.py"))
-    manifestupdate.update(logger, wpt_dir, True)

tools/lint/wpt_manifest.yml

@@ -1,11 +0,0 @@
----
-wpt_manifest:
-    description: web-platform-tests manifest lint
-    include:
-        - testing/web-platform/tests
-        - testing/web-platform/mozilla/tests
-    exclude: []
-    support-files:
-        - tools/lint/wpt/wpt_manifest.py
-    type: structured_log
-    payload: wpt.wpt_manifest:lint