Telemetry: sets key_mobile_sites to use "mobile" user agent type.

tools/perf/page_sets/key_mobile_sites.json

 {
     "description": "Mobile sites for M25",
     "credentials_path": "../data/credentials.json",
+    "user_agent_type": "mobile",
     "pages": [
         {
             "url": "http://www.androidpolice.com/2012/10/03/rumor-evidence-mounts-that-an-lg-optimus-g-nexus-is-coming-along-with-a-nexus-phone-certification-program/",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
         {
             "url": "http://nytimes.com/",
             "scrolling": {
@@ skipping 211 matching lines @@
             }
         },
         {
             "url": "http://techcrunch.com",
             "why": "top tech blog",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
         {
-            "url": "ttp://br.337.com/pages/196/DDTank",
+            "url": "http://br.337.com/pages/196/DDTank",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
         {
             "url": "http://culturalsolutions.co.uk/",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         },
@@ skipping 102 matching lines @@
         },
         {
             "url": "http://www.baidu.com/s?wd=barack+obama&rsv_bp=0&rsv_spt=3&rsv_sug3=9&rsv_sug=0&rsv_sug4=3824&rsv_sug1=3&inputT=4920",
             "scrolling": {
                 "action": "scrolling_interaction"
             }
         }
     ]
 }