Create swapped-out opener RVHs after a process swap.

content/browser/site_instance_impl.cc

Index: content/browser/site_instance_impl.cc
diff --git a/content/browser/site_instance_impl.cc b/content/browser/site_instance_impl.cc
index 792afc5e0a1799b8834254089f865c7224898bc7..131189e0ee47a9041cf17e738e2a771120b8e52e 100644
--- a/content/browser/site_instance_impl.cc
+++ b/content/browser/site_instance_impl.cc
@@ -142,6 +142,11 @@ SiteInstance* SiteInstanceImpl::GetRelatedSiteInstance(const GURL& url) {
   return browsing_instance_->GetSiteInstanceForURL(url);
 }
 
+bool SiteInstanceImpl::IsRelatedSiteInstance(const SiteInstance* instance) {
+  return browsing_instance_ ==
+      static_cast<const SiteInstanceImpl*>(instance)->browsing_instance_;
+}
+
 bool SiteInstanceImpl::HasWrongProcessForURL(const GURL& url) const {
   // Having no process isn't a problem, since we'll assign it correctly.
   if (!HasProcess())