Fix SessionStorage confusion between RenderViewHostImpl and NavigationController.

content/browser/web_contents/interstitial_page_impl.h

Index: content/browser/web_contents/interstitial_page_impl.h
diff --git a/content/browser/web_contents/interstitial_page_impl.h b/content/browser/web_contents/interstitial_page_impl.h
index be4bd8c9f3b5019483e51c56335fc24379b41856..699d8e4fcd0fc01a165c0eec56691f47aea6a38d 100644
--- a/content/browser/web_contents/interstitial_page_impl.h
+++ b/content/browser/web_contents/interstitial_page_impl.h
@@ -129,6 +129,8 @@ class CONTENT_EXPORT InterstitialPageImpl
                                  const gfx::Rect& initial_pos) OVERRIDE;
   virtual void ShowCreatedFullscreenWidget(int route_id) OVERRIDE;
 
+  virtual SessionStorageNamespace* GetSessionStorageNamespace() OVERRIDE;
+
   // RenderWidgetHostDelegate implementation:
   virtual void RenderWidgetDeleted(
       RenderWidgetHostImpl* render_widget_host) OVERRIDE;
@@ -241,6 +243,8 @@ class CONTENT_EXPORT InterstitialPageImpl
 
   base::WeakPtrFactory<InterstitialPageImpl> weak_ptr_factory_;
 
+  scoped_refptr<SessionStorageNamespace> session_storage_namespace_;
+
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageImpl);
 };