[Telemetry] Remove new_tab benchmark & related page sets

tools/perf/page_sets/new_tab_page.py

-# Copyright 2015 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.
-import time
-
-from telemetry.page import page as page_module
-from telemetry.page import shared_page_state
-from telemetry import story
-
-INTERACTION_NAME = 'Interaction.PageLoading'
-
-# How long to wait for the page to finish rendering.
-LOADING_DELAY_S = 5
-
-
-class NewTabPagePage(page_module.Page):
-
-  def __init__(self, page_set):
-    super(NewTabPagePage, self).__init__(
-      name='newtabpagepage',
-      url='chrome://newtab',
-      shared_page_state_class=shared_page_state.SharedDesktopPageState,
-      page_set=page_set)
-    self.archive_data_file = 'data/new_tab_page_page.json'
-    self.script_to_evaluate_on_commit = (
-        "console.time('" + INTERACTION_NAME + "');")
-
-  def RunNavigateSteps(self, action_runner):
-    url = self.file_path_url_with_scheme if self.is_file else self.url
-    action_runner.Navigate(
-        url, script_to_evaluate_on_commit=self.script_to_evaluate_on_commit)
-    # We pause for a while so the async JS gets a chance to run.
-    time.sleep(LOADING_DELAY_S)
-    # TODO(beaudoin): We have no guarantee the page has fully rendered and the
-    #   JS has fully executed at that point. The right way to do it would be to
-    #   toggle a Javascript variable in the page code and to wait for it here.
-    #   This should be done when window.performance.mark is supported and we
-    #   migrate to it instead of calling console.timeEnd here. If the test is
-    #   failing flakily, we should use a better heuristic.
-    action_runner.ExecuteJavaScript(
-        "console.timeEnd('" + INTERACTION_NAME + "');")
-
-
-class NewTabPagePageSet(story.StorySet):
-  def __init__(self):
-    super(NewTabPagePageSet, self).__init__(
-        archive_data_file='data/new_tab_page_page.json',
-        cloud_storage_bucket=story.PUBLIC_BUCKET)
-    self.AddStory(NewTabPagePage(page_set=self))