Remove chromium.webkit recipe test config for win8 bot.

testing/buildbot/chromium.webkit.json

Index: testing/buildbot/chromium.webkit.json
diff --git a/testing/buildbot/chromium.webkit.json b/testing/buildbot/chromium.webkit.json
index ae6474d18f3f0a9fb0ffbcb8a9fe79cd93fe78e8..6d216f328a5616c424e6318026844bd987b1d28e 100644
--- a/testing/buildbot/chromium.webkit.json
+++ b/testing/buildbot/chromium.webkit.json
@@ -1258,32 +1258,6 @@
       }
     ]
   },
-  "WebKit Win8": {
-    "gtest_tests": [
-      {
-        "test": "blink_heap_unittests"
-      },
-      {
-        "test": "blink_platform_unittests"
-      },
-      {
-        "test": "webkit_unit_tests"
-      },
-      {
-        "test": "wtf_unittests"
-      }
-    ],
-    "scripts": [
-      {
-        "name": "webkit_lint",
-        "script": "webkit_lint.py"
-      },
-      {
-        "name": "webkit_python_tests",
-        "script": "webkit_python_tests.py"
-      }
-    ]
-  },
   "WebKit XP": {
     "gtest_tests": [
       {