Change logging statements to not use the "%" operator.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/driver.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 316 matching lines @@
                 _log.error("content_shell took too long to startup.")
 
     def _wait_for_server_process_output(self, server_process, deadline, text):
         output = ''
         line = server_process.read_stdout_line(deadline)
         while not server_process.timed_out and not server_process.has_crashed() and not text in line.rstrip():
             output += line
             line = server_process.read_stdout_line(deadline)
 
         if server_process.timed_out or server_process.has_crashed():
-            _log.error('Failed to start the %s process: \n%s' % (server_process.name(), output))
+            _log.error('Failed to start the %s process: \n%s', server_process.name(), output)
             return False
 
         return True
 
     def _run_post_start_tasks(self):
         # Remote drivers may override this to delay post-start tasks until the server has ack'd.
         if self._profiler:
             self._profiler.attach_to_pid(self._pid_on_target())
 
     def _pid_on_target(self):
@@ skipping 34 matching lines @@
             self._crashed_pid = self._server_process.pid()
         elif (error_line.startswith("#CRASHED - ")
               or error_line.startswith("#PROCESS UNRESPONSIVE - ")):
             # WebKitTestRunner uses this to report that the WebProcess subprocess crashed.
             match = re.match('#(?:CRASHED|PROCESS UNRESPONSIVE) - (\S+)', error_line)
             self._crashed_process_name = match.group(1) if match else 'WebProcess'
             match = re.search('pid (\d+)', error_line)
             pid = int(match.group(1)) if match else None
             self._crashed_pid = pid
             # FIXME: delete this after we're sure this code is working :)
-            _log.debug('%s crash, pid = %s, error_line = %s' % (self._crashed_process_name, str(pid), error_line))
+            _log.debug('%s crash, pid = %s, error_line = %s', self._crashed_process_name, str(pid), error_line)
             if error_line.startswith("#PROCESS UNRESPONSIVE - "):
                 self._subprocess_was_unresponsive = True
                 self._port.sample_process(self._crashed_process_name, self._crashed_pid)
                 # We want to show this since it's not a regular crash and probably we don't have a crash log.
                 self.error_from_test += error_line
             return True
         return self.has_crashed()
 
     def _check_for_leak(self, error_line):
         if error_line.startswith("#LEAK - "):
@@ skipping 138 matching lines @@
         self.decoded_content = None
         self.malloc = None
         self.js_heap = None
         self.stdin_path = None
 
     def decode_content(self):
         if self.encoding == 'base64' and self.content is not None:
             self.decoded_content = base64.b64decode(self.content)
         else:
             self.decoded_content = self.content