Remove a renderer -> browser roundtrip for resolving the showNotification promise.

We always confirm, so we may as well remove the roundtrip together.

BUG=432527

Review URL: https://codereview.chromium.org/803523002

Cr-Commit-Position: refs/heads/master@{#308111}

content/browser/notifications/notification_message_filter.cc

@@ -101,7 +101,6 @@ void NotificationMessageFilter::OnShowPlatformNotification(
 }
 
 void NotificationMessageFilter::OnShowPersistentNotification(
-    int request_id,
     int64 service_worker_registration_id,
     const GURL& origin,
     const SkBitmap& icon,
@@ -120,8 +119,6 @@ void NotificationMessageFilter::OnShowPersistentNotification(
                                          icon,
                                          notification_data,
                                          process_id_);
-
-  Send(new PlatformNotificationMsg_DidShowPersistent(request_id));
 }
 
 void NotificationMessageFilter::OnClosePlatformNotification(

content/browser/notifications/notification_message_filter.h

@@ -48,7 +48,6 @@ class NotificationMessageFilter : public BrowserMessageFilter {
       const SkBitmap& icon,
       const PlatformNotificationData& notification_data);
   void OnShowPersistentNotification(
-      int request_id,
       int64 service_worker_registration_id,
       const GURL& origin,
       const SkBitmap& icon,

content/child/notifications/notification_manager.cc

@@ -173,8 +173,6 @@ WebNotificationPermission NotificationManager::checkPermission(
 bool NotificationManager::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NotificationManager, message)
-    IPC_MESSAGE_HANDLER(PlatformNotificationMsg_DidShowPersistent,
-                        OnDidShowPersistent)
     IPC_MESSAGE_HANDLER(PlatformNotificationMsg_DidShow, OnDidShow);
     IPC_MESSAGE_HANDLER(PlatformNotificationMsg_DidClose, OnDidClose);
     IPC_MESSAGE_HANDLER(PlatformNotificationMsg_DidClick, OnDidClick);
@@ -184,18 +182,6 @@ bool NotificationManager::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
-void NotificationManager::OnDidShowPersistent(int request_id) {
-  blink::WebNotificationShowCallbacks* callbacks =
-      persistent_notification_requests_.Lookup(request_id);
-  DCHECK(callbacks);
-
-  // There currently isn't a case in which the promise would be rejected per
-  // our implementation, so always resolve it here.
-  callbacks->onSuccess();
-
-  persistent_notification_requests_.Remove(request_id);
-}
-
 void NotificationManager::OnDidShow(int notification_id) {
   const auto& iter = active_notifications_.find(notification_id);
   if (iter == active_notifications_.end())
@@ -268,6 +254,10 @@ void NotificationManager::DisplayPersistentNotification(
     int64 service_worker_registration_id,
     int request_id,
     scoped_refptr<NotificationImageLoader> image_loader) {
+  blink::WebNotificationShowCallbacks* callbacks =
+      persistent_notification_requests_.Lookup(request_id);
+  DCHECK(callbacks);
+
   SkBitmap icon;
   if (image_loader) {
     pending_persistent_notifications_.erase(image_loader);
@@ -276,11 +266,16 @@ void NotificationManager::DisplayPersistentNotification(
 
   thread_safe_sender_->Send(
       new PlatformNotificationHostMsg_ShowPersistent(
-          request_id,
           service_worker_registration_id,
           GURL(origin.string()),
           icon,
           ToPlatformNotificationData(notification_data)));
+
+  // There currently isn't a case in which the promise would be rejected per
+  // our implementation, so always resolve it here.
+  callbacks->onSuccess();
+
+  persistent_notification_requests_.Remove(request_id);
 }
 
 bool NotificationManager::RemovePendingPageNotification(

content/child/notifications/notification_manager.h

@@ -69,7 +69,6 @@ class NotificationManager : public blink::WebNotificationManager,
       NotificationDispatcher* notification_dispatcher);
 
   // IPC message handlers.
-  void OnDidShowPersistent(int request_id);
   void OnDidShow(int notification_id);
   void OnDidClose(int notification_id);
   void OnDidClick(int notification_id);

content/common/platform_notification_messages.h

@@ -30,11 +30,6 @@ IPC_STRUCT_TRAITS_END()
 
 // Messages sent from the browser to the renderer.
 
-// Informs the renderer that the browser has displayed the persistent
-// notification.
-IPC_MESSAGE_CONTROL1(PlatformNotificationMsg_DidShowPersistent,
-                     int /* request_id */)
-
 // Informs the renderer that the browser has displayed the notification.
 IPC_MESSAGE_CONTROL1(PlatformNotificationMsg_DidShow,
                      int /* notification_id */)
@@ -55,8 +50,7 @@ IPC_MESSAGE_CONTROL4(PlatformNotificationHostMsg_Show,
                      SkBitmap /* icon */,
                      content::PlatformNotificationData /* notification_data */)
 
-IPC_MESSAGE_CONTROL5(PlatformNotificationHostMsg_ShowPersistent,
-                     int /* request_id */,
+IPC_MESSAGE_CONTROL4(PlatformNotificationHostMsg_ShowPersistent,
                      int64 /* service_worker_provider_id */,
                      GURL /* origin */,
                      SkBitmap /* icon */,