Remove loading_profile measurement since it's not used and uses profiler wrongly.

tools/perf/measurements/loading_profile.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.
-
-import os
-import tempfile
-
-from metrics import loading
-from telemetry.core.platform.profiler import perf_profiler
-from telemetry.page import page_test
-from telemetry.value import scalar
-
-
-class LoadingProfile(page_test.PageTest):
-  options = {'page_repeat': 2}
-
-  def __init__(self):
-    super(LoadingProfile, self).__init__(discard_first_result=True)
-
-  def CustomizeBrowserOptions(self, options):
-    if not perf_profiler.PerfProfiler.is_supported(browser_type='any'):
-      raise Exception('This measurement is not supported on this platform')
-
-    perf_profiler.PerfProfiler.CustomizeBrowserOptions(
-        browser_type='any', options=options)
-
-  def WillNavigateToPage(self, page, tab):
-    tab.browser.StartProfiling(perf_profiler.PerfProfiler.name(),
-                               os.path.join(tempfile.mkdtemp(),
-                                            page.file_safe_name))
-
-  def ValidateAndMeasurePage(self, page, tab, results):
-    # In current telemetry tests, all tests wait for DocumentComplete state,
-    # but we need to wait for the load event.
-    tab.WaitForJavaScriptExpression('performance.timing.loadEventStart', 300)
-
-    profile_files = tab.browser.StopProfiling()
-
-    loading.LoadingMetric().AddResults(tab, results)
-
-    profile_file = None
-    for profile_file in profile_files:
-      if 'renderer' in profile_file:
-        break
-
-    for function, period in perf_profiler.PerfProfiler.GetTopSamples(
-        profile_file, 10).iteritems():
-      results.AddValue(scalar.ScalarValue(
-          results.current_page, function.replace('.', '_'), 'period', period))