Make the AbstractParallelRebaselineCommand rebaseline function public/non-protected.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline.py

 # Copyright 2016 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.
 
 """A command to download new baselines for NeedsRebaseline tests.
 
 This command checks the list of tests with NeedsRebaseline expectations,
 and downloads the latest baselines for those tests from the results archived
 by the continuous builders.
 """
@@ skipping 241 matching lines @@
             # Save the current branch name and check out a clean branch for the patch.
             old_branch_name_or_ref = tool.scm().current_branch_or_ref()
             if old_branch_name_or_ref == self.AUTO_REBASELINE_BRANCH_NAME:
                 rebaseline_branch_name = self.AUTO_REBASELINE_ALT_BRANCH_NAME
             if not options.dry_run:
                 tool.scm().delete_branch(rebaseline_branch_name)
                 tool.scm().create_clean_branch(rebaseline_branch_name)
                 did_switch_branches = True
 
             if test_prefix_list:
-                self._rebaseline(options, test_prefix_list)
+                self.rebaseline(options, test_prefix_list)
 
             if options.dry_run:
                 return
 
             tool.scm().commit_locally_with_message(
                 self.commit_message(author, revision, commit, bugs))
 
             # FIXME: It would be nice if we could dcommit the patch without uploading, but still
             # go through all the precommit hooks. For rebaselines with lots of files, uploading
             # takes a long time and sometimes fails, but we don't want to commit if, e.g. the
@@ skipping 16 matching lines @@
                     issue_already_closed = tool.executive.run_command(
                         ['git', 'config', 'branch.%s.rietveldissue' % rebaseline_branch_name],
                         return_exit_code=True)
                     if not issue_already_closed:
                         self._run_git_cl_command(options, ['set_close'])
 
                 tool.scm().ensure_cleanly_tracking_remote_master()
                 if old_branch_name_or_ref:
                     tool.scm().checkout_branch(old_branch_name_or_ref)
                 tool.scm().delete_branch(rebaseline_branch_name)