Expose API on VariationsService to set the restrict mode param.

chrome/browser/policy/policy_browsertest.cc

 // Copyright (c) 2012 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.
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 3530 matching lines @@
   }
 };
 
 IN_PROC_BROWSER_TEST_F(PolicyVariationsServiceTest, VariationsURLIsValid) {
   const std::string default_variations_url =
       chrome_variations::VariationsService::
           GetDefaultVariationsServerURLForTesting();
 
   const GURL url =
       chrome_variations::VariationsService::GetVariationsServerURL(
-          g_browser_process->local_state());
+          g_browser_process->local_state(), std::string());
   EXPECT_TRUE(StartsWithASCII(url.spec(), default_variations_url, true));
   std::string value;
   EXPECT_TRUE(net::GetValueForKeyInQuery(url, "restrict", &value));
   EXPECT_EQ("restricted", value);
 }
 
 IN_PROC_BROWSER_TEST_F(PolicyTest, NativeMessagingBlacklistSelective) {
   base::ListValue blacklist;
   blacklist.Append(new base::StringValue("host.name"));
   PolicyMap policies;
@@ skipping 63 matching lines @@
   EXPECT_TRUE(content::ExecuteScriptAndExtractBool(
       browser2->tab_strip_model()->GetActiveWebContents(),
       "domAutomationController.send(window.showModalDialog !== undefined);",
       &result));
   EXPECT_TRUE(result);
 }
 
 #endif  // !defined(CHROME_OS)
 
 }  // namespace policy