Fix handling of setting a single proxy in Proxy Settings API

chrome/test/data/extensions/api_test/proxy/single/test.js

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // proxy api test
 // browser_tests.exe --gtest_filter=ExtensionApiTest.ProxyFixedSingle
 
 chrome.test.runTests([
   function setSingleProxy() {
     var oneProxy = {
-      scheme: "http",
       host: "127.0.0.1",
       port: 100
     };
 
-    // Single proxy should override HTTP proxy.
-    var httpProxy = {
-      host: "8.8.8.8"
-    };
-
-    // Single proxy should not override SOCKS proxy.
-    var socksProxy = {
-      host: "9.9.9.9"
-    };
-
     var rules = {
-      singleProxy: oneProxy,
-      proxyForHttp: httpProxy,
-      socksProxy: socksProxy,
+      singleProxy: oneProxy
     };
 
     var config = { rules: rules, mode: "fixed_servers" };
     chrome.experimental.proxy.useCustomProxySettings(config);
     chrome.test.succeed();
   }
 ]);