Move SessionStorageNamespace entirely into NavigationController and support StoragePartitions.

chrome/browser/ui/omnibox/omnibox_edit_model.cc

Index: chrome/browser/ui/omnibox/omnibox_edit_model.cc
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.cc b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
index 82537dbdbe996aa46f2745812114719a1c8cee73..d24f566f93c703589f322a80ab82854420ed36f2 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.cc
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
@@ -1165,8 +1165,8 @@ void OmniboxEditModel::DoPrerender(const AutocompleteMatch& match) {
   tab->web_contents()->GetView()->GetContainerBounds(&container_bounds);
   AutocompleteActionPredictorFactory::GetForProfile(profile_)->
       StartPrerendering(match.destination_url,
-                        tab->web_contents()->GetRenderViewHost()->
-                            GetSessionStorageNamespace(),
+                        tab->web_contents()->GetController()
+                            .GetSessionStorageNamespaceMap(),
                         container_bounds.size());
 }