Remove useless statements from signin screen apps policy test

chrome/browser/chromeos/policy/device_cloud_policy_browsertest.cc

 // Copyright 2014 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 <memory>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 331 matching lines @@
 
   static enterprise_management::ExternalPolicyData
   BuildTestComponentPolicyPayload() {
     ComponentPolicyBuilder builder;
     MakeTestComponentPolicyBuilder(&builder);
     return builder.payload();
   }
 
  private:
   void SetFakeDevicePolicy() {
-    device_policy()->policy_data().set_username(PolicyBuilder::kFakeUsername);
     device_policy()->policy_data().set_public_key_version(
         kFakePolicyPublicKeyVersion);
     device_policy()->Build();
     session_manager_client()->set_device_policy(device_policy()->GetBlob());
   }
 
   static void MakeTestComponentPolicyBuilder(ComponentPolicyBuilder* builder) {
     builder->policy_data().set_policy_type(
         dm_protocol::kChromeSigninExtensionPolicyType);
-    builder->policy_data().set_username(PolicyBuilder::kFakeUsername);
     builder->policy_data().set_settings_entity_id(kTestExtensionId);
     builder->policy_data().set_public_key_version(kFakePolicyPublicKeyVersion);
     builder->payload().set_download_url(kFakePolicyUrl);
     builder->payload().set_secure_hash(crypto::SHA256HashString(kFakePolicy));
     builder->Build();
   }
 
   DISALLOW_COPY_AND_ASSIGN(SigninExtensionsDeviceCloudPolicyBrowserTestBase);
 };
 
@@ skipping 168 matching lines @@
   ASSERT_TRUE(extension);
   Browser* browser = CreateBrowser(GetSigninProfile());
   extensions::ResultCatcher result_catcher;
   ui_test_utils::NavigateToURL(
       browser, extension->GetResourceURL(kTestExtensionTestPage));
   EXPECT_TRUE(result_catcher.GetNextResult());
   CloseBrowserSynchronously(browser);
 }
 
 }  // namespace policy