[tools/perf] Reference legacy_page_test module instead of page_test

tools/perf/benchmarks/jetstream.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.
 
 """Runs Apple's JetStream benchmark.
 
 JetStream combines a variety of JavaScript benchmarks, covering a variety of
 advanced workloads and programming techniques, and reports a single score that
 balances them using geometric mean.
 
 Each benchmark measures a distinct workload, and no single optimization
 technique is sufficient to speed up all benchmarks. Latency tests measure that
 a web application can start up quickly, ramp up to peak performance quickly,
 and run smoothly without interruptions. Throughput tests measure the sustained
 peak performance of a web application, ignoring ramp-up time and spikes in
 smoothness. Some benchmarks demonstrate trade-offs, and aggressive or
 specialized optimization for one benchmark might make another benchmark slower.
 """
 
 import json
 import os
 
 from core import perf_benchmark
 
 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.util import statistics
 from telemetry.value import list_of_scalar_values
 
 
-class _JetstreamMeasurement(page_test.PageTest):
+class _JetstreamMeasurement(legacy_page_test.LegacyPageTest):
 
   def __init__(self):
     super(_JetstreamMeasurement, self).__init__()
 
   def WillNavigateToPage(self, page, tab):
     page.script_to_evaluate_on_commit = """
         var __results = [];
         var __real_log = window.console.log;
         window.console.log = function() {
           __results.push(Array.prototype.join.call(arguments, ' '));
@@ skipping 45 matching lines @@
 
   def CreateStorySet(self, options):
     ps = story.StorySet(
         archive_data_file='../page_sets/data/jetstream.json',
         base_dir=os.path.dirname(os.path.abspath(__file__)),
         cloud_storage_bucket=story.INTERNAL_BUCKET)
     ps.AddStory(page_module.Page(
         'http://browserbench.org/JetStream/', ps, ps.base_dir,
         make_javascript_deterministic=False))
     return ps