[Offline pages] Properly informing observers when offline page is deleted

components/offline_pages/offline_page_model.cc

Index: components/offline_pages/offline_page_model.cc
diff --git a/components/offline_pages/offline_page_model.cc b/components/offline_pages/offline_page_model.cc
index 7b0922eb5c8272de21ff62e74309f2e0500b5d7a..3ea2d6ef8e183a03edbee896cd2aeb7182948e76 100644
--- a/components/offline_pages/offline_page_model.cc
+++ b/components/offline_pages/offline_page_model.cc
@@ -569,6 +569,12 @@ void OfflinePageModel::OnRemoveOfflinePagesDone(
         "OfflinePages.DeletePage.PageSize", iter->second.file_size / 1024);
     UMA_HISTOGRAM_COUNTS(
         "OfflinePages.DeletePage.AccessCount", iter->second.access_count);
+    // If the page is not marked for deletion at this point, the model has not
+    // yet informed the observer that the offline page is deleted.
+    if (!iter->second.IsMarkedForDeletion()) {
+      FOR_EACH_OBSERVER(Observer, observers_,
+                        OfflinePageDeleted(iter->second.bookmark_id));
+    }
     offline_pages_.erase(iter);
   }
   if (bookmark_ids.size() > 1) {