Remove self._builder_data from Rebaseline classes.

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

 # Copyright (c) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 267 matching lines @@
                 self._add_to_scm_later(path)
         self._print_scm_changes()
 
 
 class AbstractParallelRebaselineCommand(AbstractRebaseliningCommand):
     """Base class for rebaseline commands that do some tasks in parallel."""
     # Not overriding execute() - pylint: disable=abstract-method
 
     def __init__(self, options=None):
         super(AbstractParallelRebaselineCommand, self).__init__(options=options)
-        self._builder_data = {}
 
+    @memoized
     def builder_data(self):
-        if not self._builder_data:
-            for builder_name in self._release_builders():
-                builder = self._tool.buildbot.builder_with_name(builder_name)
-                builder_results = builder.latest_layout_test_results()
-                if builder_results:
-                    self._builder_data[builder_name] = builder_results
-                else:
-                    raise Exception("No result for builder %s." % builder_name)
-        return self._builder_data
+        builder_to_results = {}
+        for builder_name in self._release_builders():
+            builder = self._tool.buildbot.builder_with_name(builder_name)
+            builder_results = builder.latest_layout_test_results()
+            if builder_results:
+                builder_to_results[builder_name] = builder_results
+            else:
+                raise Exception("No result for builder %s." % builder_name)
+        return builder_to_results
 
     # The release builders cycle much faster than the debug ones and cover all the platforms.
     def _release_builders(self):
         release_builders = []
         for builder_name in self._tool.builders.all_continuous_builder_names():
             if 'ASAN' in builder_name:
                 continue
             port = self._tool.port_factory.get_from_builder_name(builder_name)
             if port.test_configuration().build_type == 'release':
                 release_builders.append(builder_name)
@@ skipping 605 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)