Fix <webview> subframe resource loads with PlzNavigate.

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 49bed78f3fbaa04b4f4797391d347aadaca92e4a..6ffe7a6aff21d34913a9d505c01b61e81a48872b 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -450,6 +450,11 @@ void NavigationRequest::OnStartChecksComplete(
     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.