Fixes the interactive default browser UX for policy setting

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index d8b9bc6ec6df5e9c92024f949453409e9a932d66..5007a5a72d1906e88d2c09aca038afbb89ba325c 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -1196,8 +1196,17 @@ void BrowserProcessImpl::CreateGCMDriver() {
 
 void BrowserProcessImpl::ApplyDefaultBrowserPolicy() {
   if (local_state()->GetBoolean(prefs::kDefaultBrowserSettingEnabled)) {
+    // 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.
     scoped_refptr<shell_integration::DefaultWebClientWorker>
-        set_browser_worker = new shell_integration::DefaultBrowserWorker(NULL);
+        set_browser_worker = new shell_integration::DefaultBrowserWorker(
+            nullptr,
+            /*delete_observer=*/false);
+    // The user interaction must always be disabled when applying the default
+    // browser policy since it is done at each browser startup and the result
+    // of the interaction cannot be forced.
+    set_browser_worker->set_interactive_permitted(false);
     set_browser_worker->StartSetAsDefault();
   }
 }