Kill AddError/AddErrorMessage from PageTestResults.

tools/telemetry/telemetry/results/page_test_results_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 os
 from telemetry.results import base_test_results_unittest
 
 from telemetry.page import page_set
 from telemetry.results import page_test_results
 
 class NonPrintingPageTestResults(
@@ skipping 15 matching lines @@
   def pages(self):
     return self.page_set.pages
 
   def test_failures(self):
     results = NonPrintingPageTestResults()
     results.AddFailure(self.pages[0], self.CreateException())
     results.AddSuccess(self.pages[1])
     self.assertEquals(results.pages_that_had_failures,
                       set([self.pages[0]]))
     self.assertEquals(results.successes, [self.pages[1]])
-
-  def test_errors(self):
-    results = NonPrintingPageTestResults()
-    results.AddError(self.pages[0], self.CreateException())
-    results.AddSuccess(self.pages[1])
-    self.assertEquals(results.pages_that_had_errors,
-                      set([self.pages[0]]))
-    self.assertEquals(results.successes, [self.pages[1]])
-
-  def test_errors_and_failures(self):
-    results = NonPrintingPageTestResults()
-    results.AddError(self.pages[0], self.CreateException())
-    results.AddError(self.pages[1], self.CreateException())
-    results.AddSuccess(self.pages[2])
-    self.assertEquals(results.pages_that_had_errors_or_failures,
-                      set([self.pages[0], self.pages[1]]))
-    self.assertEquals(results.successes, [self.pages[2]])