Fix errors in start with URL tests

tools/perf/page_sets/startup_pages.json

 {
   "description": [ 
   "Pages for testing starting Chrome with a URL. ",
   "Note that this file can't be used with record_wpr, since record_wpr ",
   "requires a true navigate step, which we do not want for startup testing.",
   "Instead use record_wpr startup_pages_record to record data for this test."],
   "archive_data_file": "data/startup_pages.json",
   "pages": [
     {
       "url": "about:blank",
       "why": "typical page",
       "navigate_steps" : [
         {"action": "set_startup_url", "startup_url": "about:blank"},
         {"action": "wait", "seconds": 10 }
       ]
     },
     {
-      "url": "http://news.bbc.co.uk",
+      "url": "http://bbc.co.uk",
       "why": "typical page",
       "navigate_steps" : [
-        {"action": "set_startup_url", "startup_url": "http://news.bbc.co.uk"},
+        {"action": "set_startup_url", "startup_url": "http://bbc.co.uk"},
         {"action": "wait", "seconds": 10 }
       ]
     },
     {
       "url": "http://kapook.com",
       "why": "Horribly complex page - stress test!",
       "navigate_steps" : [
         {"action": "set_startup_url", "startup_url": "http://kapook.com"},
         {"action": "wait", "seconds": 10 }
       ]
     }
   ]
 }