Switch buildershandler over to using the json mirror.

Tools/TestResultServer/static-dashboards/builders_unittest.jsonp

 // This file is auto-generated by Tools/TestResultServer/generate_builders_json.py. It should not be manually modified.
 // It uses jsonp instead of proper json because we want to be able to load it from a file URL in Chrome for local testing.
 LOAD_BUILDBOT_DATA({
     "no_upload_test_types": [
         "webkit_unit_tests"
     ],
     "masters": [
         {
             "groups": [
                 "@ToT Chromium"
             ],
             "name": "ChromiumWin",
+            "url_name": "chromium.win",
             "tests": {
                 "ash_unittests": {
                     "builders": [
                         "Win Aura Tests (1)",
                         "Win8 Aura"
                     ]
                 },
                 "browser_tests": {
                     "builders": [
                         "Vista Tests (1)",
@@ skipping 12 matching lines @@
                 },
                 "unit_tests": {
                     "builders": [
                         "Win 7 Tests x64 (3)",
                         "Win Aura Tests (2)",
                         "Win7 Tests (dbg)(1)",
                         "XP Tests (3)",
                     ]
                 },
             },
-            "url": "http://build.chromium.org/p/chromium.win"
         },
         {
             "groups": [
                 "@ToT Chromium"
             ],
             "name": "ChromiumMac",
+            "url_name": "chromium.mac",
             "tests": {
                 "base_unittests": {
                     "builders": [
                         "Mac 10.6 Tests (dbg)(3)",
                         "Mac 10.7 Tests (dbg)(3)",
                         "Mac10.6 Tests (1)",
                         "Mac10.7 Tests (1)",
                         "iOS Simulator (dbg)"
                     ]
                 },
                 "browser_tests": {
                     "builders": [
                         "Mac 10.6 Tests (dbg)(1)",
                         "Mac10.7 Tests (2)",
                         "Mac10.7 Tests (3)"
                     ]
                 },
                 "unit_tests": {
                     "builders": [
                         "Mac 10.6 Tests (dbg)(4)",
                         "iOS Simulator (dbg)"
                     ]
                 },
             },
-            "url": "http://build.chromium.org/p/chromium.mac"
         },
         {
             "groups": [
                 "@ToT Chromium",
                 "@ToT Blink"
             ],
             "name": "ChromiumWebkit",
+            "url_name": "chromium.webkit",
             "tests": {
                 "base_unittests": {
                     "builders": [
                         "Android Tests (dbg)"
                     ]
                 },
                 "layout-tests": {
                     "builders": [
                         "WebKit Android (Nexus4)",
                         "WebKit Linux",
                         "WebKit Mac10.6",
                         "WebKit Mac10.7 (dbg)",
                         "WebKit Mac10.8",
                         "WebKit Win7",
                         "WebKit XP",
                         "WebKit XP (deps)"
                     ]
                 },
                 "webkit_unit_tests": {
                     "builders": [
                         "Android Tests (dbg)",
                         "WebKit Linux",
                         "WebKit XP",
                         "WebKit XP (deps)"
                     ]
                 },
             },
-            "url": "http://build.chromium.org/p/chromium.webkit"
         },
     ]
 });