Update Power Test to be 60/20/10 test.

client/site_tests/power_LoadTest/extension/manifest.json

 {
   "format_version": 1,
   "id": "00023456789ABCDEF0123456789ABCDEF012CEEE",
   "version": "1.0",
-  "name": "Power Test ",
+  "name": "Power Test",
   "browser_action": {
     "default_icon": "skin/chrome_bug.png",
     "default_title": "test the web with the web"
   },
   "icons": { "48": "skin/chrome_bug.png",
           "128": "skin/chrome_bug.png" },
   "permissions": [
     "http://*/", "https://*/", "tabs"
   ],
   "background_page": "background.html",
   "description": "GoogleTest",
   "content_scripts": [
     {
       "matches": ["http://*/*", "https://*/*"],
       "js": ["ct.js"],
       "run_at": "document_end", 
       "all_frames": false
     }
   ]
 }