Revert of Turn VariationsService::GetVariationsServerURL into instance method

chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc

Index: chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc
diff --git a/chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc b/chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc
index 603a98106544da74d71c2adbcb414eca63fd644a..a997ec94fce13fa7dbe37d9cee4f906880d7746a 100644
--- a/chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc
+++ b/chrome/browser/chromeos/policy/variations_service_policy_browsertest.cc
@@ -42,9 +42,8 @@
           GetDefaultVariationsServerURLForTesting();
 
   // Device policy has updated the cros settings.
-  const GURL url =
-      g_browser_process->variations_service()->GetVariationsServerURL(
-          g_browser_process->local_state(), std::string());
+  const GURL url = chrome_variations::VariationsService::GetVariationsServerURL(
+      g_browser_process->local_state(), std::string());
   EXPECT_TRUE(base::StartsWith(url.spec(), default_variations_url,
                                base::CompareCase::SENSITIVE));
   std::string value;