Fix <webview> subframe resource loads with PlzNavigate.

content/browser/frame_host/navigation_request.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/navigation_request.h"
 
 #include <utility>
 
 #include "content/browser/devtools/render_frame_devtools_agent_host.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 432 matching lines @@
   CHECK(result != NavigationThrottle::DEFER);
 
   // Abort the request if needed. This will destroy the NavigationRequest.
   if (result == NavigationThrottle::CANCEL_AND_IGNORE ||
       result == NavigationThrottle::CANCEL) {
     // TODO(clamy): distinguish between CANCEL and CANCEL_AND_IGNORE.
     frame_tree_node_->ResetNavigationRequest(false);
     return;
   }
 
+  if (result == NavigationThrottle::BLOCK_REQUEST) {
+    OnRequestFailed(false, net::ERR_BLOCKED_BY_CLIENT);
+    return;
+  }
+
   // Use the SiteInstance of the navigating RenderFrameHost to get access to
   // the StoragePartition. Using the url of the navigation will result in a
   // wrong StoragePartition being picked when a WebView is navigating.
   DCHECK_NE(AssociatedSiteInstanceType::NONE, associated_site_instance_type_);
   RenderFrameHostImpl* navigating_frame_host =
       associated_site_instance_type_ == AssociatedSiteInstanceType::SPECULATIVE
           ? frame_tree_node_->render_manager()->speculative_frame_host()
           : frame_tree_node_->current_frame_host();
   DCHECK(navigating_frame_host);
 
@@ skipping 103 matching lines @@
   DCHECK_EQ(request_params_.has_user_gesture, begin_params_.has_user_gesture);
 
   render_frame_host->CommitNavigation(response_.get(), std::move(body_),
                                       common_params_, request_params_,
                                       is_view_source_);
 
   frame_tree_node_->ResetNavigationRequest(true);
 }
 
 }  // namespace content