Fix: Prerendering was confusing SessionService to not save sessionStorage.

webkit/dom_storage/dom_storage_session.cc

Index: webkit/dom_storage/dom_storage_session.cc
diff --git a/webkit/dom_storage/dom_storage_session.cc b/webkit/dom_storage/dom_storage_session.cc
index 57aedfa475e8ca1a39bb5b7c0c36a76c587f0582..76b58a445a1a289781bef8f279bf9b25d07222a2 100644
--- a/webkit/dom_storage/dom_storage_session.cc
+++ b/webkit/dom_storage/dom_storage_session.cc
@@ -40,6 +40,10 @@ void DomStorageSession::SetShouldPersist(bool should_persist) {
   should_persist_ = should_persist;
 }
 
+bool DomStorageSession::should_persist() const {
+  return should_persist_;
+}
+
 bool DomStorageSession::IsFromContext(DomStorageContext* context) {
   return context_.get() == context;
 }