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

ios/chrome/browser/favicon/ios_chrome_favicon_loader_factory.mm

 // Copyright 2015 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 "ios/chrome/browser/favicon/ios_chrome_favicon_loader_factory.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
@@ skipping 25 matching lines @@
   DependsOn(ios::FaviconServiceFactory::GetInstance());
 }
 
 IOSChromeFaviconLoaderFactory::~IOSChromeFaviconLoaderFactory() {}
 
 std::unique_ptr<KeyedService>
 IOSChromeFaviconLoaderFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
-  return base::WrapUnique(
-      new FaviconLoader(ios::FaviconServiceFactory::GetForBrowserState(
-          browser_state, ServiceAccessType::IMPLICIT_ACCESS)));
+  return base::MakeUnique<FaviconLoader>(
+      ios::FaviconServiceFactory::GetForBrowserState(
+          browser_state, ServiceAccessType::IMPLICIT_ACCESS));
 }
 
 web::BrowserState* IOSChromeFaviconLoaderFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
   return GetBrowserStateRedirectedInIncognito(context);
 }
 
 bool IOSChromeFaviconLoaderFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }