Fix how Save-Page-As responds to web requests blocked by extensions.

content/browser/download/save_package.cc

Index: content/browser/download/save_package.cc
diff --git a/content/browser/download/save_package.cc b/content/browser/download/save_package.cc
index cf8149a52df6f074085af5a62a0a3fd8a8107ddd..d4b3e7822ee40f57e638bad03b98caa723bea48c 100644
--- a/content/browser/download/save_package.cc
+++ b/content/browser/download/save_package.cc
@@ -1006,8 +1006,14 @@ void SavePackage::GetSerializedHtmlWithLocalLinksForFrame(
       target_frame_tree_node_id);
   if (it != frame_tree_node_id_to_contained_save_items_.end()) {
     for (SaveItem* save_item : it->second) {
-      // Calculate the local link to use for this |save_item|.
-      DCHECK(save_item->has_final_name());
+      // Skip items that failed to save.
+      if (!save_item->has_final_name()) {
+        DCHECK_EQ(SaveItem::SaveState::COMPLETE, save_item->state());
+        DCHECK(!save_item->success());
+        continue;
+      }
+
+      // Calculate the relative path for referring to the |save_item|.
       base::FilePath local_path(base::FilePath::kCurrentDirectory);
       if (target_tree_node->IsMainFrame()) {
         local_path = local_path.Append(saved_main_directory_path_.BaseName());