[Telemetry] Make session restore benchmark not require arguments.

tools/perf/benchmarks/session_restore_with_url.py

-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-from telemetry import test
-
-from measurements import session_restore_with_url
-
-
-class SessionRestoreWithUrlCold(test.Test):
-  """Measure Chrome cold session restore with startup URLs."""
-  tag = 'cold'
-  test = session_restore_with_url.SessionRestoreWithUrl
-  page_set = 'page_sets/startup_pages.py'
-  options = {'cold': True,
-             'pageset_repeat': 5}
-
-class SessionRestoreWithUrlWarm(test.Test):
-  """Measure Chrome warm session restore with startup URLs."""
-  tag = 'warm'
-  test = session_restore_with_url.SessionRestoreWithUrl
-  page_set = 'page_sets/startup_pages.py'
-  options = {'warm': True,
-             'pageset_repeat': 10}
-