Remove the overridden _stop_running_server method in WPTServe.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py
index b4635b98faedb6c18ae90afc11f49dc4e0147121..d2e7b0bc1a11dbe1540c17b65268904241716c44 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/wptserve.py
@@ -49,7 +49,6 @@ class WPTServe(server_base.ServerBase):
         self._cwd = path_to_wpt_root
         self._env = port_obj.host.environ.copy()
         self._env.update({'PYTHONPATH': path_to_thirdparty})
-        self._keep_process_reference = True

[qyearsley, 2017/01/11 23:52:23]

This is also unused, but removing this line is not necessary in this CL I think.

         self._start_cmd = start_cmd
 
         expiration_date = datetime.date(2025, 1, 4)
@@ -58,20 +57,3 @@ class WPTServe(server_base.ServerBase):
                 'Pre-generated keys and certificates are going to be expired at %s.'
                 ' Please re-generate them by following steps in %s/README.chromium.'
                 % (expiration_date.strftime('%b %d %Y'), path_to_wpt_support))
-
-    def _stop_running_server(self):
-        while self._pid and self._executive.check_running_pid(self._pid):
-            # TODO(burnik): Figure out a cleaner way of stopping wptserve.
-            if self._platform.is_win():
-                self._executive.kill_process(self._pid)
-            else:
-                self._executive.interrupt(self._pid)
-
-            # According to Popen.wait(), this can deadlock when using stdout=PIPE and/or stderr=PIPE.
-            # We're using DEVNULL for both so that should not occur.
-            if self._process is not None:
-                self._process.wait()
-
-        # Clean up the pid file.
-        if self._filesystem.exists(self._pid_file):
-            self._filesystem.remove(self._pid_file)