Use std::unique_ptr to express ownership of base::Value in PolicyMap::Entry

chrome/browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_apitest_nss.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 <cryptohi.h>
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 349 matching lines @@
         base::FilePath(kTestExtensionDir).Append(kUpdateManifestFileName);
     GURL update_manifest_url(net::URLRequestMockHTTPJob::GetMockUrl(
         update_manifest_path.MaybeAsASCII()));
 
     std::unique_ptr<base::ListValue> forcelist(new base::ListValue);
     forcelist->AppendString(base::StringPrintf(
         "%s;%s", kTestExtensionID, update_manifest_url.spec().c_str()));
 
     policy::PolicyMap policy;
     policy.Set(policy::key::kExtensionInstallForcelist,
-               policy::POLICY_LEVEL_MANDATORY,
-               policy::POLICY_SCOPE_MACHINE,
-               policy::POLICY_SOURCE_CLOUD,
-               forcelist.release(),
-               NULL);
+               policy::POLICY_LEVEL_MANDATORY, policy::POLICY_SCOPE_MACHINE,
+               policy::POLICY_SOURCE_CLOUD, std::move(forcelist), nullptr);
 
     // Set the policy and wait until the extension is installed.
     extensions::TestExtensionRegistryObserver observer(
         extensions::ExtensionRegistry::Get(profile()));
     policy_provider_.UpdateChromePolicy(policy);
     observer.WaitForExtensionWillBeInstalled();
   }
 
   // Load |page_url| in |browser| and wait for PASSED or FAILED notification.
   // The functionality of this function is reduced functionality of
@@ skipping 126 matching lines @@
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(profile());
   const extensions::Extension* extension =
       GetExtensionByPath(registry->enabled_extensions(), extension_path);
   ASSERT_FALSE(extension->install_warnings().empty());
   EXPECT_EQ(
       "'enterprise.platformKeys' is not allowed for specified install "
       "location.",
       extension->install_warnings()[0].message);
 }