Re-write many calls to WrapUnique() with MakeUnique()

chrome/browser/net/disk_cache_dir_policy_handler.cc

 // Copyright 2013 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 "chrome/browser/net/disk_cache_dir_policy_handler.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "chrome/browser/policy/policy_path_parser.h"
@@ skipping 10 matching lines @@
 DiskCacheDirPolicyHandler::~DiskCacheDirPolicyHandler() {}
 
 void DiskCacheDirPolicyHandler::ApplyPolicySettings(const PolicyMap& policies,
                                                     PrefValueMap* prefs) {
   const base::Value* value = policies.GetValue(policy_name());
   base::FilePath::StringType string_value;
   if (value && value->GetAsString(&string_value)) {
     base::FilePath::StringType expanded_value =
         policy::path_parser::ExpandPathVariables(string_value);
     prefs->SetValue(prefs::kDiskCacheDir,
-                    base::WrapUnique(new base::StringValue(expanded_value)));
+                    base::MakeUnique<base::StringValue>(expanded_value));
   }
 }
 
 }  // namespace policy