Kill AddError/AddErrorMessage from PageTestResults.

tools/telemetry/telemetry/page/page_runner_unittest.py

Index: tools/telemetry/telemetry/page/page_runner_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_runner_unittest.py b/tools/telemetry/telemetry/page/page_runner_unittest.py
index 5797c75e4984366e75f21a801349485719004301..f5b15f13cb1bc1a1b55e59662b090e00ed3c8049 100644
--- a/tools/telemetry/telemetry/page/page_runner_unittest.py
+++ b/tools/telemetry/telemetry/page/page_runner_unittest.py
@@ -76,8 +76,7 @@ class PageRunnerTests(unittest.TestCase):
     SetUpPageRunnerArguments(options)
     results = page_runner.Run(Test(), ps, expectations, options)
     self.assertEquals(0, len(results.successes))
-    self.assertEquals(0, len(results.failures))
-    self.assertEquals(1, len(results.errors))
+    self.assertEquals(1, len(results.failures))
 
   def testHandlingOfTestThatRaisesWithNonFatalUnknownExceptions(self):
     ps = page_set.PageSet()
@@ -127,7 +126,6 @@ class PageRunnerTests(unittest.TestCase):
         Test(), ps, expectations, options)
     self.assertEquals(1, len(results.successes))
     self.assertEquals(0, len(results.failures))
-    self.assertEquals(0, len(results.errors))
 
   def testRetryOnBrowserCrash(self):
     ps = page_set.PageSet()
@@ -150,7 +148,6 @@ class PageRunnerTests(unittest.TestCase):
 
     self.assertEquals(1, len(results.successes))
     self.assertEquals(0, len(results.failures))
-    self.assertEquals(0, len(results.errors))
 
   @decorators.Disabled('xp')  # Flaky, http://crbug.com/390079.
   def testDiscardFirstResult(self):
@@ -476,7 +473,6 @@ class PageRunnerTests(unittest.TestCase):
     self.assertFalse(test.will_navigate_to_page_called)
     self.assertEquals(0, len(results.successes))
     self.assertEquals(0, len(results.failures))
-    self.assertEquals(0, len(results.errors))
 
   def TestUseLiveSitesFlag(self, options, expect_from_archive):
     ps = page_set.PageSet(