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

content/browser/dom_storage/session_storage_namespace_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_NAMESPACE_IMPL_H_
 #define CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_NAMESPACE_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
@@ skipping 16 matching lines @@
   // Constructs a |SessionStorageNamespaceImpl| by cloning
   // |namespace_to_clone|. Allocates new IDs for it.
   SessionStorageNamespaceImpl(DOMStorageContextWrapper* context,
                               int64 namepace_id_to_clone);
 
   // Constructs a |SessionStorageNamespaceImpl| and assigns |persistent_id|
   // to it. Allocates a new non-persistent ID.
   SessionStorageNamespaceImpl(DOMStorageContextWrapper* context,
                               const std::string& persistent_id);
 
-  // Creates an alias of |master_session_storage_namespace|. This will allocate
-  // a new non-persistent ID.
-  explicit SessionStorageNamespaceImpl(
-      SessionStorageNamespaceImpl* master_session_storage_namespace);
-
   // SessionStorageNamespace implementation.
   int64 id() const override;
   const std::string& persistent_id() const override;
   void SetShouldPersist(bool should_persist) override;
   bool should_persist() const override;
 
   SessionStorageNamespaceImpl* Clone();
   bool IsFromContext(DOMStorageContextWrapper* context);
 
-  void AddTransactionLogProcessId(int process_id) override;
-  void RemoveTransactionLogProcessId(int process_id) override;
-  void Merge(bool actually_merge,
-             int process_id,
-             SessionStorageNamespace* other,
-             const MergeResultCallback& callback) override;
-  bool IsAliasOf(SessionStorageNamespace* other) override;
-  SessionStorageNamespace* CreateAlias() override;
-
  private:
   explicit SessionStorageNamespaceImpl(DOMStorageSession* clone);
   ~SessionStorageNamespaceImpl() override;
 
   scoped_refptr<DOMStorageSession> session_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStorageNamespaceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_NAMESPACE_IMPL_H_