Safe audio video checker: create mojo client with MakeUnique<>

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.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/media_galleries/fileapi/safe_audio_video_checker.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/time/time.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/l10n/l10n_util.h"
 
 SafeAudioVideoChecker::SafeAudioVideoChecker(
     base::File file,
     const storage::CopyOrMoveFileValidator::ResultCallback& callback)
     : file_(std::move(file)), callback_(callback) {
-  DCHECK(!callback_.is_null());
+  DCHECK(callback_);
 }
 
 void SafeAudioVideoChecker::Start() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   if (!file_.IsValid()) {
     callback_.Run(base::File::FILE_ERROR_SECURITY);
     return;
   }
 
   DCHECK(!utility_process_mojo_client_);
 
-  const base::string16 utility_process_name =
-      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_MEDIA_FILE_CHECKER_NAME);
-
-  utility_process_mojo_client_.reset(
-      new content::UtilityProcessMojoClient<extensions::mojom::MediaParser>(
-          utility_process_name));
+  utility_process_mojo_client_ = base::MakeUnique<
+      content::UtilityProcessMojoClient<extensions::mojom::MediaParser>>(
+      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_MEDIA_FILE_CHECKER_NAME));
   utility_process_mojo_client_->set_error_callback(
       base::Bind(&SafeAudioVideoChecker::CheckMediaFileDone, this, false));
 
   utility_process_mojo_client_->Start();  // Start the utility process.
 
   constexpr auto kFileDecodeTime = base::TimeDelta::FromMilliseconds(250);
 
   utility_process_mojo_client_->service()->CheckMediaFile(
       kFileDecodeTime, std::move(file_),
       base::Bind(&SafeAudioVideoChecker::CheckMediaFileDone, this));
 }
 
 void SafeAudioVideoChecker::CheckMediaFileDone(bool valid) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   utility_process_mojo_client_.reset();  // Terminate the utility process.
   callback_.Run(valid ? base::File::FILE_OK : base::File::FILE_ERROR_SECURITY);
 }
 
 SafeAudioVideoChecker::~SafeAudioVideoChecker() = default;