[Tests not passing yet] Remove prerender sessionStorage namespace merging.

chrome/browser/prerender/prerender_handle.h

Index: chrome/browser/prerender/prerender_handle.h
diff --git a/chrome/browser/prerender/prerender_handle.h b/chrome/browser/prerender/prerender_handle.h
index 427dd8ad119b759a5f6f8d3eacbfef38c72a5ebd..e28bcf5ead63f19ac69f320c06967a2b741cfe63 100644
--- a/chrome/browser/prerender/prerender_handle.h
+++ b/chrome/browser/prerender/prerender_handle.h
@@ -90,13 +90,6 @@ class PrerenderHandle : public base::NonThreadSafe,
   // the other PrerenderHandle object specified.
   bool RepresentingSamePrerenderAs(PrerenderHandle* other) const;
 
-  // Retrieves the SessionStorageNamespace of the underlying prerender, if
-  // available.
-  content::SessionStorageNamespace* GetSessionStorageNamespace() const;
-
-  // Returns the child id of the prerender.
-  int GetChildId() const;
-
  private:
   friend class PrerenderManager;