Update the CHECK in 'NavigationHandleImpl::GetRenderFrameHost()'

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index a6267b6e28471d552d15d095eec511c5f3964c4c..a31508c18e0e1ec27973f27cbb510d2398d4090a 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -183,9 +183,12 @@ net::Error NavigationHandleImpl::GetNetErrorCode() {
 }
 
 RenderFrameHostImpl* NavigationHandleImpl::GetRenderFrameHost() {
-  CHECK(state_ >= READY_TO_COMMIT)
-      << "This accessor should only be called "
-         "after the navigation is ready to commit.";
+  // TODO(mkwst): Change this to check against 'READY_TO_COMMIT' once
+  // ReadyToCommitNavigation is available whether or not PlzNavigate is
+  // enabled. https://crbug.com/621856
+  CHECK_GE(state_, WILL_PROCESS_RESPONSE)
+      << "This accessor should only be called after a response has been "
+         "delivered for processing.";
   return render_frame_host_;
 }