Remove unused tools/safely-roll-blink.py

It will require an update of the gardening documentation to point to
safely-roll-deps.py instead of safely-roll-blink.py:
http://www.chromium.org/blink/gardening

BUG=None
TBR=eseidel@chromium.org (current LGTM not accepted...)

Review URL: https://codereview.chromium.org/523573002

Cr-Commit-Position: refs/heads/master@{#292633}

tools/safely-roll-blink.py

-#!/usr/bin/env python
-# Copyright (c) 2012 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.
-
-"""Generate a CL to roll Blink to the specified revision number and post
-it to Rietveld so that the CL will land automatically if it passes the
-commit-queue's checks.
-"""
-
-import logging
-import optparse
-import os
-import re
-import sys
-
-import find_depot_tools
-import scm
-import subprocess2
-
-
-def die_with_error(msg):
-  print >> sys.stderr, msg
-  sys.exit(1)
-
-
-def process_deps(path, new_rev, is_dry_run):
-  """Update webkit_revision to |new_issue|.
-
-  A bit hacky, could it be made better?
-  """
-  content = open(path).read()
-  old_line = r'(\s+)"webkit_revision": "(\d+)",'
-  new_line = r'\1"webkit_revision": "%d",' % new_rev
-  new_content = re.sub(old_line, new_line, content, 1)
-  old_rev = re.search(old_line, content).group(2)
-  if not old_rev or new_content == content:
-    die_with_error('Failed to update the DEPS file')
-
-  if not is_dry_run:
-    open(path, 'w').write(new_content)
-  return old_rev
-
-
-def main():
-  tool_dir = os.path.dirname(os.path.abspath(__file__))
-  parser = optparse.OptionParser(usage='%prog [options] <new blink rev>')
-  parser.add_option('-v', '--verbose', action='count', default=0)
-  parser.add_option('--dry-run', action='store_true')
-  parser.add_option('--commit', action='store_true', default=True,
-                    help='(default) Put change in commit queue on upload.')
-  parser.add_option('--no-commit', action='store_false', dest='commit',
-                    help='Don\'t put change in commit queue on upload.')
-  parser.add_option('-r', '--reviewers', default='',
-                    help='Add given users as either reviewers or TBR as'
-                    ' appropriate.')
-  parser.add_option('--upstream', default='origin/master',
-                    help='(default "%default") Use given start point for change'
-                    ' to upload. For instance, if you use the old git workflow,'
-                    ' you might set it to "origin/trunk".')
-  parser.add_option('--cc', help='CC email addresses for issue.')
-
-  options, args = parser.parse_args()
-  logging.basicConfig(
-      level=
-          [logging.WARNING, logging.INFO, logging.DEBUG][
-            min(2, options.verbose)])
-  if len(args) != 1:
-    parser.print_help()
-    exit(0)
-
-  root_dir = os.path.dirname(tool_dir)
-  os.chdir(root_dir)
-
-  new_rev = int(args[0])
-
-  # Silence the editor.
-  os.environ['EDITOR'] = 'true'
-
-  old_branch = scm.GIT.GetBranch(root_dir)
-  if old_branch == 'blink_roll':
-    parser.error(
-        'Please delete the branch blink_roll and move to a different branch')
-
-  if not options.dry_run:
-    subprocess2.check_output(
-        ['git', 'checkout', '-b', 'blink_roll', options.upstream])
-
-  try:
-    old_rev = int(process_deps(os.path.join(root_dir, 'DEPS'), new_rev,
-                               options.dry_run))
-    print 'Blink roll %s:%s' % (old_rev, new_rev)
-
-    review_field = 'TBR' if options.commit else 'R'
-    commit_msg = ('Blink roll %s:%s\n'
-                 '\n'
-                 'http://build.chromium.org/f/chromium/perf/dashboard/ui/'
-                 'changelog_blink.html?url=/trunk&range=%s:%s&mode=html'
-                 '\n'
-                 '%s=%s\n' % (old_rev, new_rev,
-                              old_rev+1, new_rev,
-                              review_field,
-                              options.reviewers))
-
-    if options.dry_run:
-      print 'Commit message: ' + commit_msg
-      return 0
-
-    subprocess2.check_output(['git', 'commit', '-m', commit_msg, 'DEPS'])
-    subprocess2.check_call(['git', 'diff', options.upstream])
-    upload_cmd = ['git', 'cl', 'upload']
-    if options.commit:
-      upload_cmd.append('--use-commit-queue')
-    if options.reviewers:
-      upload_cmd.append('--send-mail')
-    if options.cc:
-      upload_cmd.extend(['--cc', options.cc])
-    subprocess2.check_call(upload_cmd)
-  finally:
-    if not options.dry_run:
-      subprocess2.check_output(['git', 'checkout', old_branch])
-      subprocess2.check_output(['git', 'branch', '-D', 'blink_roll'])
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main())