[Telemetry] Do not have benchmarks validate story name in expectations during runs.

telemetry/telemetry/internal/story_runner_unittest.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 json
 import math
 import os
 import shutil
 import StringIO
 import sys
@@ skipping 1206 matching lines @@
         shutil.rmtree(tmp_path)
 
   def testRunBenchmarkDisabledStoryWithBadName(self):
     fake_benchmark = FakeBenchmark()
     fake_benchmark.story_disabled = True
     options = self._GenerateBaseBrowserFinderOptions()
     tmp_path = tempfile.mkdtemp()
     try:
       options.output_dir = tmp_path
       rc = story_runner.RunBenchmark(fake_benchmark, options)
-      # The exception from not having a matching name is caught and the return
-      # code is set to a failure code.
-      self.assertEqual(rc, 255)
+      # Test should return 0 since only error messages are logged.
+      self.assertEqual(rc, 0)
     finally:
       shutil.rmtree(tmp_path)