Added update_test_expectations script to remove non-flaky test expectations.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/builders.py

 # Copyright (C) 2011 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 75 matching lines @@
     debug_builder_name = None
     for builder_name, builder_info in _exact_matches.items():
         if builder_info['port_name'] == target_port_name:
             if 'dbg' in builder_name:
                 debug_builder_name = builder_name
             else:
                 return builder_name
     return debug_builder_name
 
 
+def builder_name_for_specifiers(version, build_type):

[bokan, 2016/03/04 03:44:10]

It seems like this would be needed elsewhere, does this function exist already?

+    for builder_name, info in _exact_matches.items():
+        specifiers = info['specifiers']
+        if specifiers[0].lower() == version.lower() and specifiers[1].lower() == build_type.lower():
+            return builder_name
+
+    return ''
+
+
 def builder_path_for_port_name(port_name):
     builder_path_from_name(builder_name_for_port_name(port_name))