Remove startup_url from PageSet, we can now only specify startup_url on a Page.

tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py

Index: tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py
diff --git a/tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py b/tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py
index e2f0a06b6fa1103800e6f6ac90db002d88adfbdd..c7e353ccc0c346d7df714ef3f70c7d30725b255b 100644
--- a/tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py
+++ b/tools/telemetry/telemetry/unittest_util/page_set_smoke_test.py
@@ -104,10 +104,6 @@ class PageSetSmokeTest(unittest.TestCase):
         isinstance(page_set.make_javascript_deterministic, bool),
         msg='page_set\'s make_javascript_deterministic must have type bool')
 
-    self.assertTrue(
-        isinstance(page_set.startup_url, str),
-        msg='page_set\'s startup_url must have type string')
-
   def CheckAttributesOfPageBasicAttributes(self, page):
     self.assertTrue(not hasattr(page, 'disabled'))
     self.assertTrue(
@@ -123,6 +119,10 @@ class PageSetSmokeTest(unittest.TestCase):
     self.assertTrue(
        isinstance(page.labels, set),
        msg='page %s \'s labels field must have type set' % page.display_name)
+    self.assertTrue(
+        isinstance(page.startup_url, str),
+        msg=('page %s \'s startup_url field must have type string'

[slamm, 2014/12/05 22:24:29]

BTW, self.assertIsInstance is available.

+            % page.display_name))
     for l in page.labels:
       self.assertTrue(
          isinstance(l, str),