PlzNavigate: only allow main frame resource loads for extensions

extensions/browser/extension_protocols.cc

Index: extensions/browser/extension_protocols.cc
diff --git a/extensions/browser/extension_protocols.cc b/extensions/browser/extension_protocols.cc
index 7e73dc89fd08ea32e64c4f9774c29bbd55704726..2e68e37defa366d90e72da13f386be5dc6349cf4 100644
--- a/extensions/browser/extension_protocols.cc
+++ b/extensions/browser/extension_protocols.cc
@@ -369,7 +369,7 @@ bool AllowExtensionResourceLoad(net::URLRequest* request,
   // PlzNavigate: frame navigations to extensions have already been checked in
   // the ExtensionNavigationThrottle.
   if (info->GetChildID() == -1 &&
-      content::IsResourceTypeFrame(info->GetResourceType()) &&
+      info->GetResourceType() == content::RESOURCE_TYPE_MAIN_FRAME &&
       content::IsBrowserSideNavigationEnabled()) {
     return true;
   }