Update reference to page_test module to use legacy_page_test module

content/test/gpu/gpu_tests/gpu_process.py

 # Copyright 2013 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 gpu_tests import gpu_process_expectations as expectations
 from gpu_tests import gpu_test_base
 import page_sets
 
-from telemetry.page import page_test
+from telemetry.page import legacy_page_test
 
 test_harness_script = r"""
   var domAutomationController = {};
   domAutomationController._finished = false;
   domAutomationController.setAutomationId = function(id) {}
   domAutomationController.send = function(msg) {
     domAutomationController._finished = true;
   }
 
   window.domAutomationController = domAutomationController;
@@ skipping 15 matching lines @@
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
 
   def ValidateAndMeasurePage(self, page, tab, results):
     if hasattr(page, 'Validate'):
       page.Validate(tab, results)
     else:
       has_gpu_channel_js = 'chrome.gpuBenchmarking.hasGpuChannel()'
       has_gpu_channel = tab.EvaluateJavaScript(has_gpu_channel_js)
       if not has_gpu_channel:
-        raise page_test.Failure('No GPU channel detected')
+        raise legacy_page_test.Failure('No GPU channel detected')
 
 class GpuProcess(gpu_test_base.TestBase):
   """Tests that accelerated content triggers the creation of a GPU process"""
   test = GpuProcessValidator
 
   @classmethod
   def Name(cls):
     return 'gpu_process'
 
   def _CreateExpectations(self):
     return expectations.GpuProcessExpectations()
 
   def CreateStorySet(self, options):
     browser_type = options.browser_options.browser_type
     is_platform_android = browser_type.startswith('android')
     story_set = page_sets.GpuProcessTestsStorySet(self.GetExpectations(),
                                                   is_platform_android)
     for page in story_set:
       page.script_to_evaluate_on_commit = test_harness_script
     return story_set