Get rid of PageSet.FromDict from unittests

tools/telemetry/telemetry/page/page_test_results_unittest.py

Index: tools/telemetry/telemetry/page/page_test_results_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_test_results_unittest.py b/tools/telemetry/telemetry/page/page_test_results_unittest.py
index 25886067b1f6563452f48d42a95a8863a16085b2..01aed88c0f2117a8c10f77972653c1a89fbb4a83 100644
--- a/tools/telemetry/telemetry/page/page_test_results_unittest.py
+++ b/tools/telemetry/telemetry/page/page_test_results_unittest.py
@@ -18,15 +18,10 @@ class NonPrintingPageTestResults(
 
 class PageTestResultsTest(unittest.TestCase):
   def setUp(self):
-    self.page_set = page_set.PageSet.FromDict({
-        "description": "hello",
-        "archive_path": "foo.wpr",
-        "pages": [
-          {"url": "http://www.bar.com/"},
-          {"url": "http://www.baz.com/"},
-          {"url": "http://www.foo.com/"}
-          ]
-        }, os.path.dirname(__file__))
+    self.page_set = page_set.PageSet(file_path=os.path.dirname(__file__))
+    self.page_set.AddPageWithDefaultRunNavigate("http://www.bar.com/")
+    self.page_set.AddPageWithDefaultRunNavigate("http://www.baz.com/")
+    self.page_set.AddPageWithDefaultRunNavigate("http://www.foo.com/")
 
   @property
   def pages(self):