Cleanup ios/web_view.

ios/web_view/internal/criwv_web_main_delegate.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.
 
 #import "ios/web_view/internal/criwv_web_main_delegate.h"
 
+#include "base/memory/ptr_util.h"
 #import "ios/web_view/internal/criwv_web_client.h"
 #import "ios/web_view/public/criwv_delegate.h"
 
 namespace ios_web_view {
 
-CRIWVWebMainDelegate::CRIWVWebMainDelegate(id<CRIWVDelegate> delegate) {
-  delegate_ = delegate;
-}
+CRIWVWebMainDelegate::CRIWVWebMainDelegate(id<CRIWVDelegate> delegate)
+    : delegate_(delegate) {}
 
 CRIWVWebMainDelegate::~CRIWVWebMainDelegate() {}
 
 void CRIWVWebMainDelegate::BasicStartupComplete() {
-  web_client_.reset(new CRIWVWebClient(delegate_));
+  web_client_ = base::MakeUnique<CRIWVWebClient>(delegate_);
   web::SetWebClient(web_client_.get());
 }
 
 }  // namespace ios_web_view