Remove the inheritance from PageTestResults to unittest.TestResult.

tools/telemetry/telemetry/results/page_test_results_unittest.py

Index: tools/telemetry/telemetry/results/page_test_results_unittest.py
diff --git a/tools/telemetry/telemetry/results/page_test_results_unittest.py b/tools/telemetry/telemetry/results/page_test_results_unittest.py
index 2aef9ed8a7921ef57db24e6d831ef5c318753303..482d02077c1ded8c3928d1018c61c044309185f4 100644
--- a/tools/telemetry/telemetry/results/page_test_results_unittest.py
+++ b/tools/telemetry/telemetry/results/page_test_results_unittest.py
@@ -32,8 +32,7 @@ class PageTestResultsTest(base_test_results_unittest.BaseTestResultsUnittest):
     results.AddSuccess(self.pages[1])
     self.assertEquals(results.pages_that_had_failures,
                       set([self.pages[0]]))
-    self.assertEquals(results.successes,
-                      [self.pages[1].display_name])
+    self.assertEquals(results.successes, [self.pages[1]])
 
   def test_errors(self):
     results = NonPrintingPageTestResults()
@@ -41,8 +40,7 @@ class PageTestResultsTest(base_test_results_unittest.BaseTestResultsUnittest):
     results.AddSuccess(self.pages[1])
     self.assertEquals(results.pages_that_had_errors,
                       set([self.pages[0]]))
-    self.assertEquals(results.successes,
-                      [self.pages[1].display_name])
+    self.assertEquals(results.successes, [self.pages[1]])
 
   def test_errors_and_failures(self):
     results = NonPrintingPageTestResults()
@@ -51,5 +49,4 @@ class PageTestResultsTest(base_test_results_unittest.BaseTestResultsUnittest):
     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].display_name])
+    self.assertEquals(results.successes, [self.pages[2]])