Rename cert_based_register_request to match server proto.

chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc

Index: chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
index 21fea22c740707ed423b79ba5a0ae9e9744e7afc..77b76efcc7163ca24882fcf5b4815b88b6eb5ab3 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos_unittest.cc
@@ -613,7 +613,8 @@ class DeviceCloudPolicyManagerChromeOSEnrollmentTest
     if (ShouldRegisterWithCert()) {
       em::CertificateBasedDeviceRegistrationData data;
       const em::SignedData& signed_request =
-          register_request_.cert_based_register_request().signed_request();
+          register_request_.certificate_based_register_request()
+              .signed_request();
       EXPECT_TRUE(data.ParseFromString(signed_request.data().substr(
           0,
           signed_request.data().size() - signed_request.extra_data_bytes())));