Return unique_ptr from WebClient::CreateWebMainParts()

ios/chrome/browser/web/chrome_web_client.mm

 // 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 "ios/chrome/browser/web/chrome_web_client.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/ios/ios_util.h"
 #include "base/mac/bundle_locations.h"
@@ skipping 41 matching lines @@
                  << base::SysNSStringToUTF8(error.description);
   DCHECK(content);
   return content;
 }
 }
 
 ChromeWebClient::ChromeWebClient() {}
 
 ChromeWebClient::~ChromeWebClient() {}
 
-web::WebMainParts* ChromeWebClient::CreateWebMainParts() {
-  return new IOSChromeMainParts(*base::CommandLine::ForCurrentProcess());
+std::unique_ptr<web::WebMainParts> ChromeWebClient::CreateWebMainParts() {
+  return base::MakeUnique<IOSChromeMainParts>(

[Eugene But (OOO till 7-30), 2017/01/20 22:11:41]

Please add include of ptr_util everywhere where base::MakeUnique is used.

[michaeldo, 2017/01/23 17:30:54]

Done.

+      *base::CommandLine::ForCurrentProcess());
 }
 
 void ChromeWebClient::PreWebViewCreation() const {
   // Initialize the audio session to allow a web page's audio to continue
   // playing after the app is backgrounded.
   VoiceSearchProvider* voice_provider =
       ios::GetChromeBrowserProvider()->GetVoiceSearchProvider();
   if (voice_provider) {
     AudioSessionController* audio_controller =
         voice_provider->GetAudioSessionController();
@@ skipping 104 matching lines @@
   // If this call fails, web will fall back to the default params.
   *params_vector =
       task_scheduler_util::GetBrowserWorkerPoolParamsFromVariations();
   *index_to_traits_callback =
       base::Bind(&task_scheduler_util::BrowserWorkerPoolIndexForTraits);
 }
 
 void ChromeWebClient::PerformExperimentalTaskSchedulerRedirections() {
   task_scheduler_util::MaybePerformBrowserTaskSchedulerRedirection();
 }