Remove deprecated and unused run_and_throw_if_fail from webkitpy

Tools/Scripts/webkitpy/common/system/executive_mock.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 64 matching lines @@
 
     def running_pids(self, process_name_filter):
         running_pids = []
         for process_name, process_pid in self._running_pids.iteritems():
             if process_name_filter(process_name):
                 running_pids.append(process_pid)
 
         _log.info("MOCK running_pids: %s" % running_pids)
         return running_pids
 
-    def run_and_throw_if_fail(self, args, quiet=False, cwd=None, env=None):
-        self.calls.append(args)
-        if self._should_log:
-            env_string = ""
-            if env:
-                env_string = ", env=%s" % env
-            _log.info("MOCK run_and_throw_if_fail: %s, cwd=%s%s" % (args, cwd, env_string))
-        if self._should_throw_when_run.intersection(args):
-            raise ScriptError("Exception for %s" % args, output="MOCK command output")
-        return "MOCK output of child process"
-
     def command_for_printing(self, args):
         string_args = map(unicode, args)
         return " ".join(string_args)
 
     def run_command(self,
                     args,
                     cwd=None,
                     input=None,
                     error_handler=None,
                     return_exit_code=False,
@@ skipping 94 matching lines @@
         if self._run_command_fn:
             return self._run_command_fn(args)
         if return_exit_code:
             return self._exit_code
         if self._exit_code and error_handler:
             script_error = ScriptError(script_args=args, exit_code=self._exit_code, output=self._output)
             error_handler(script_error)
         if return_stderr:
             return self._output + self._stderr
         return self._output