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

chrome/browser/signin/test_signin_client_builder.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 "chrome/browser/signin/test_signin_client_builder.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/signin/core/browser/test_signin_client.h"
 
 namespace signin {
 
 std::unique_ptr<KeyedService> BuildTestSigninClient(
     content::BrowserContext* context) {
-  return base::WrapUnique(
-      new TestSigninClient(static_cast<Profile*>(context)->GetPrefs()));
+  return base::MakeUnique<TestSigninClient>(
+      static_cast<Profile*>(context)->GetPrefs());
 }
 
 }  // namespace signin