Chrome Cleaner UI: Use BrowserThread's DeleteOnIOThread for ChromePromptImpl

chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_CHROME_CLEANER_CHROME_CLEANER_RUNNER_WIN_H_
 #define CHROME_BROWSER_SAFE_BROWSING_CHROME_CLEANER_CHROME_CLEANER_RUNNER_WIN_H_
 
 #include <limits>
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/process/launch.h"
 #include "base/process/process.h"
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/safe_browsing/chrome_cleaner/reporter_runner_win.h"
 #include "chrome/browser/safe_browsing/chrome_cleaner/srt_chrome_prompt_impl.h"
 #include "components/chrome_cleaner/public/interfaces/chrome_prompt.mojom.h"
+#include "content/public/browser/browser_thread.h"
 
 namespace safe_browsing {
 
 // Class responsible for launching the cleaner process and waiting for its
 // completion when the InBrowserCleanerUI feature is enabled. This object is
 // also responsible for starting the ChromePromptImpl object on the IO thread
 // and controlling its lifetime.
 //
 // Expected lifecycle of a ChromeCleanerRunner:
 //
@@ skipping 91 matching lines @@
   void OnConnectionClosed();
   void OnProcessDone(LaunchStatus launch_status);
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   base::CommandLine cleaner_command_line_;
   ChromePromptImpl::OnPromptUser on_prompt_user_;
   base::OnceClosure on_connection_closed_;
   ProcessDoneCallback on_process_done_;
 
-  std::unique_ptr<ChromePromptImpl> chrome_prompt_impl_;
+  std::unique_ptr<ChromePromptImpl, content::BrowserThread::DeleteOnIOThread>
+      chrome_prompt_impl_;
 };
 
 // A delegate class used to override launching of the Cleaner proccess for
 // tests.
 class ChromeCleanerRunnerTestDelegate {
  public:
   virtual ~ChromeCleanerRunnerTestDelegate() = default;
 
   // Called instead of base::LaunchProcess() during testing.
   virtual base::Process LaunchTestProcess(
       const base::CommandLine& command_line,
       const base::LaunchOptions& launch_options) = 0;
 };
 
 void SetChromeCleanerRunnerTestDelegateForTesting(
     ChromeCleanerRunnerTestDelegate* test_delegate);
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_CHROME_CLEANER_CHROME_CLEANER_RUNNER_WIN_H_