Chrome Cleaner UI: Use BrowserThread's DeleteOnIOThread for ChromePromptImpl

chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h

Index: chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h
diff --git a/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h b/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h
index 8664d564609d8d60e2a8146ea11414cfedfdfb6b..6d050180aa00d09406f3d0cd8c1fecb51a027d25 100644
--- a/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h
+++ b/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_runner_win.h
@@ -20,6 +20,7 @@
 #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 {
 
@@ -131,7 +132,8 @@ class ChromeCleanerRunner
   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