Fix SessionStorage confusion between RenderViewHostImpl and NavigationController.

content/browser/web_contents/interstitial_page_impl.cc

Index: content/browser/web_contents/interstitial_page_impl.cc
diff --git a/content/browser/web_contents/interstitial_page_impl.cc b/content/browser/web_contents/interstitial_page_impl.cc
index 5ab2134e695c81ef987595e677e93f3599040819..8c9ec4675eb1656481b9c3d9eb903364105747ec 100644
--- a/content/browser/web_contents/interstitial_page_impl.cc
+++ b/content/browser/web_contents/interstitial_page_impl.cc
@@ -493,7 +493,7 @@ RenderViewHost* InterstitialPageImpl::CreateRenderViewHost() {
   DOMStorageContextImpl* dom_storage_context =
       static_cast<DOMStorageContextImpl*>(BrowserContext::GetStoragePartition(
           browser_context, site_instance.get())->GetDOMStorageContext());
-  SessionStorageNamespaceImpl* session_storage_namespace_impl =
+  session_storage_namespace_ =
       new SessionStorageNamespaceImpl(dom_storage_context);
 
   RenderViewHostImpl* render_view_host =
@@ -502,8 +502,7 @@ RenderViewHost* InterstitialPageImpl::CreateRenderViewHost() {
                              this,
                              MSG_ROUTING_NONE,
                              MSG_ROUTING_NONE,
-                             false,
-                             session_storage_namespace_impl);
+                             false);
   web_contents_->RenderViewForInterstitialPageCreated(render_view_host);
   return render_view_host;
 }
@@ -704,6 +703,10 @@ void InterstitialPageImpl::ShowCreatedFullscreenWidget(int route_id) {
       << "InterstitialPage does not support showing full screen popups.";
 }
 
+SessionStorageNamespace* InterstitialPageImpl::GetSessionStorageNamespace() {
+  return session_storage_namespace_.get();
+}
+
 void InterstitialPageImpl::Disable() {
   enabled_ = false;
 }