[tools/perf] Reference legacy_page_test module instead of page_test

tools/perf/benchmarks/speedometer.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.
 
 """Apple's Speedometer performance benchmark.
 
 Speedometer measures simulated user interactions in web applications.
 
 The current benchmark uses TodoMVC to simulate user actions for adding,
 completing, and removing to-do items. Speedometer repeats the same actions using
 DOM APIs - a core set of web platform APIs used extensively in web applications-
 as well as six popular JavaScript frameworks: Ember.js, Backbone.js, jQuery,
 AngularJS, React, and Flight. Many of these frameworks are used on the most
 popular websites in the world, such as Facebook and Twitter. The performance of
 these types of operations depends on the speed of the DOM APIs, the JavaScript
 engine, CSS style resolution, layout, and other technologies.
 """
 
 import os
 
 from core import perf_benchmark
 
 from benchmarks import v8_helper
 
 from telemetry import benchmark
 from telemetry import page as page_module
-from telemetry.page import page_test
+from telemetry.page import legacy_page_test
 from telemetry import story
 from telemetry.value import list_of_scalar_values
 
 from metrics import keychain_metric
 
 
-class SpeedometerMeasurement(page_test.PageTest):
+class SpeedometerMeasurement(legacy_page_test.LegacyPageTest):
   enabled_suites = [
       'VanillaJS-TodoMVC',
       'EmberJS-TodoMVC',
       'BackboneJS-TodoMVC',
       'jQuery-TodoMVC',
       'AngularJS-TodoMVC',
       'React-TodoMVC',
       'FlightJS-TodoMVC'
   ]
 
@@ skipping 62 matching lines @@
 
 @benchmark.Disabled('reference')  # crbug.com/579546
 class SpeedometerIgnition(Speedometer):
   def SetExtraBrowserOptions(self, options):
     super(SpeedometerIgnition, self).SetExtraBrowserOptions(options)
     v8_helper.EnableIgnition(options)
 
   @classmethod
   def Name(cls):
     return 'speedometer-ignition'