Issue 6453 - Update buildtools dep. to c830dfa08e2f, add custom ID and updateURL

ensure_dependencies.py

 #!/usr/bin/env 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 sys
 import os
 import posixpath
 import re
@@ skipping 29 matching lines @@
   adblockpluschrome = git:git@github.com:user/adblockpluschrome.git@1fad3a7
 '''
 
 SKIP_DEPENDENCY_UPDATES = os.environ.get(
     'SKIP_DEPENDENCY_UPDATES', ''
 ).lower() not in ('', '0', 'false')
 
 NPM_LOCKFILE = '.npm_install_lock'
 
 
-class Mercurial():
+class Mercurial:
     def istype(self, repodir):
         return os.path.exists(os.path.join(repodir, '.hg'))
 
     def clone(self, source, target):
         if not source.endswith('/'):
             source += '/'
         subprocess.check_call(['hg', 'clone', '--quiet', '--noupdate', source, target])
 
     def get_revision_id(self, repo, rev=None):
         command = ['hg', 'id', '--repository', repo, '--id']
@@ skipping 26 matching lines @@
         with open(config_path, 'w') as stream:
             config.write(stream)
 
         module = os.path.relpath(target, repo)
         _ensure_line_exists(ignore_path, module)
 
     def postprocess_url(self, url):
         return url
 
 
-class Git():
+class Git:
     def istype(self, repodir):
         return os.path.exists(os.path.join(repodir, '.git'))
 
     def clone(self, source, target):
         source = source.rstrip('/')
         if not source.endswith('.git'):
             source += '.git'
         subprocess.check_call(['git', 'clone', '--quiet', source, target])
 
     def get_revision_id(self, repo, rev='HEAD'):
@@ skipping 330 matching lines @@
     args = parser.parse_args()
 
     if args.quiet:
         logging.disable(logging.INFO)
 
     repos = args.repos
     if not len(repos):
         repos = [os.path.dirname(__file__)]
     for repo in repos:
         resolve_deps(repo)