[Release] Remove usage of roll ref

tools/release/mergeinfo.py

 #!/usr/bin/env python
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import os
 import sys
 
 from search_related_commits import git_execute
@@ skipping 39 matching lines @@
   return commits.splitlines()
 
 def get_branches_for_commit(git_working_dir, hash_to_search):
   branches = git_execute(git_working_dir, ['branch',
                                            '--contains',
                                            hash_to_search,
                                            '-a']).strip()
   branches = branches.splitlines()
   return map(str.strip, branches)
 
-def is_rolling(git_working_dir, hash_to_search):
-  branches = get_branches_for_commit(git_working_dir, hash_to_search)
-  return 'remotes/origin/roll' in branches
-
 def is_lkgr(git_working_dir, hash_to_search):
   branches = get_branches_for_commit(git_working_dir, hash_to_search)
   return 'remotes/origin/lkgr' in branches
 
 def get_first_canary(git_working_dir, hash_to_search):
   branches = get_branches_for_commit(git_working_dir, hash_to_search)
   canaries = ([currentBranch for currentBranch in branches if
     currentBranch.startswith('remotes/origin/chromium/')])
   canaries.sort()
   if len(canaries) == 0:
     return 'No Canary coverage'
   return canaries[0].split('/')[-1]
 
 def print_analysis(git_working_dir, hash_to_search):
   print '1.) Searching for "' + hash_to_search + '"'
   print '=====================ORIGINAL COMMIT START==================='
   print describe_commit(git_working_dir, hash_to_search)
   print '=====================ORIGINAL COMMIT END====================='
-
   print '2.) General information:'
-  print 'Is rolling: ' + str(is_rolling(git_working_dir, hash_to_search))
   print 'Is LKGR: ' + str(is_lkgr(git_working_dir, hash_to_search))
   print 'Is on Canary: ' + (
     str(get_first_canary(git_working_dir, hash_to_search)))
   print '3.) Found follow-up commits, reverts and ports:'
   followups = get_followup_commits(git_working_dir, hash_to_search)
   for followup in followups:
     print describe_commit(git_working_dir, followup, True)
 
   print '4.) Found merges:'
   merges = get_merge_commits(git_working_dir, hash_to_search)
@@ skipping 15 matching lines @@
                         help='The path to your git working directory.')
 
   parser.add_argument('hash',
                       nargs=1,
                       help='Hash of the commit to be searched.')
 
   args = sys.argv[1:]
   options = parser.parse_args(args)
 
   sys.exit(print_analysis(options.git_dir, options.hash[0]))