Don't swap out the old RenderFrameHost until the new one commits.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index f63b7cf8679baee8b0b0d3bf6dab0496f1c12860..b5d8a43b870ab9444293502fa9266f9790e61204 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -1407,12 +1407,9 @@ void ResourceDispatcherHostImpl::CancelTransferringNavigation(
 void ResourceDispatcherHostImpl::ResumeDeferredNavigation(
     const GlobalRequestID& id) {
   ResourceLoader* loader = GetLoader(id);
-  if (loader) {
-    // The response we were meant to resume could have already been canceled.
-    ResourceRequestInfoImpl* info = loader->GetRequestInfo();
-    if (info->cross_site_handler())
-      info->cross_site_handler()->ResumeResponse();
-  }
+  // The response we were meant to resume could have already been canceled.
+  if (loader)
+    loader->CompleteTransfer();
 }
 
 // The object died, so cancel and detach all requests associated with it except