Kill AddError/AddErrorMessage from PageTestResults.

tools/telemetry/telemetry/benchmark.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.
 
 import logging
 import optparse
 import os
 import shutil
 import sys
 import zipfile
@@ skipping 68 matching lines @@
 
     self._DownloadGeneratedProfileArchive(args)
 
     results = page_test_results.PageTestResults()
     try:
       results = page_runner.Run(test, ps, expectations, args)
     except page_test.TestNotSupportedOnPlatformFailure as failure:
       logging.warning(str(failure))
 
     results.PrintSummary()
-    return len(results.failures) + len(results.errors)
+    return len(results.failures)
 
   def _DownloadGeneratedProfileArchive(self, options):
     """Download and extract profile directory archive if one exists."""
     archive_name = getattr(self, 'generated_profile_archive', None)
 
     # If attribute not specified, nothing to do.
     if not archive_name:
       return
 
     # If profile dir specified on command line, nothing to do.
@@ skipping 93 matching lines @@
     """
     return test_expectations.TestExpectations()
 
 
 def AddCommandLineArgs(parser):
   page_runner.AddCommandLineArgs(parser)
 
 
 def ProcessCommandLineArgs(parser, args):
   page_runner.ProcessCommandLineArgs(parser, args)