Update test_runner.py to use page_set names rather than paths.

tools/telemetry/telemetry/core/discover_unittest.py

Index: tools/telemetry/telemetry/core/discover_unittest.py
diff --git a/tools/telemetry/telemetry/core/discover_unittest.py b/tools/telemetry/telemetry/core/discover_unittest.py
index 3390b2e1b946bd74a1133be91580ac4fd2dfb190..ba2bf70107e218d90e0e816b4bc8caea7a1016f4 100644
--- a/tools/telemetry/telemetry/core/discover_unittest.py
+++ b/tools/telemetry/telemetry/core/discover_unittest.py
@@ -51,17 +51,3 @@ class DiscoverTest(unittest.TestCase):
         'dummy_exception_impl2': 'DummyExceptionImpl2',
     }
     self.assertEqual(actual_classes, expected_classes)
-
-  def testIsPageSetFile(self):
-    top_10_ps_dir = os.path.join(util.GetChromiumSrcDir(),
-                                 'tools/perf/page_sets/top_10.py')
-    top_10_json_data = os.path.join(util.GetChromiumSrcDir(),
-                                    'tools/perf/page_sets/data/top_10.json')
-    test_ps_dir = os.path.join(util.GetTelemetryDir(),
-                               'unittest_data/test_page_set.py')
-    page_set_dir = os.path.join(util.GetTelemetryDir(),
-                               'telemetry/page/page_set.py')
-    self.assertTrue(discover.IsPageSetFile(top_10_ps_dir))
-    self.assertFalse(discover.IsPageSetFile(top_10_json_data))
-    self.assertFalse(discover.IsPageSetFile(test_ps_dir))
-    self.assertFalse(discover.IsPageSetFile(page_set_dir))