Prevent RFH from attempting to transfer after it's been swapped out

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 53c566373592ee72bfa79b6a6cd4782fb7479580..7904e69d4a37051d293b2071bb780b76a14ae894 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -645,6 +645,10 @@ bool NavigationHandleImpl::MaybeTransferAndProceedInternal() {
   if (IsBrowserSideNavigationEnabled())
     return true;
 
+  // A navigation form a renderer that is no longer active should not attempt to

[nasko, 2016/10/04 16:07:39]

minor nit: s/renderer/RenderFrame/

[clamy, 2016/10/04 16:12:53]

Done.

+  // transfer.
+  CHECK(render_frame_host_->is_active());
+
   // Subframes shouldn't swap processes unless out-of-process iframes are
   // possible.
   if (!IsInMainFrame() && !SiteIsolationPolicy::AreCrossProcessFramesPossible())