Fixes the interactive default browser UX for policy setting

chrome/browser/ui/webui/options/browser_options_handler.cc

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index ea2eb7612b3f8fbbc3de910fe4e757c7c823c31a..1c4de7ab1dbe37f1017db53573033d65b787303d 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -186,7 +186,11 @@ BrowserOptionsHandler::BrowserOptionsHandler()
 #endif  // defined(OS_CHROMEOS)
       signin_observer_(this),
       weak_ptr_factory_(this) {
-  default_browser_worker_ = new shell_integration::DefaultBrowserWorker(this);
+  // The worker pointer is reference counted. While it is running, the
+  // message loops of the FILE and UI thread will hold references to it
+  // and it will be automatically freed once all its tasks have finished.
+  default_browser_worker_ = new shell_integration::DefaultBrowserWorker(
+      this, /*delete_observer=*/false);
 
 #if defined(ENABLE_SERVICE_DISCOVERY)
   cloud_print_mdns_ui_enabled_ = true;
@@ -1144,10 +1148,6 @@ void BrowserOptionsHandler::SetDefaultWebClientUIState(
   SetDefaultBrowserUIString(status_string_id);
 }
 
-bool BrowserOptionsHandler::IsInteractiveSetDefaultPermitted() {
-  return true;  // This is UI so we can allow it.
-}
-
 void BrowserOptionsHandler::SetDefaultBrowserUIString(int status_string_id) {
   base::StringValue status_string(
       l10n_util::GetStringFUTF16(status_string_id,