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

content/browser/dom_storage/session_storage_namespace_impl.h

Index: content/browser/dom_storage/session_storage_namespace_impl.h
diff --git a/content/browser/dom_storage/session_storage_namespace_impl.h b/content/browser/dom_storage/session_storage_namespace_impl.h
index 025ee8729dac06372c6c933bdb4e849001ba373b..83a9866241ef63b310993dbb5ae6c7a4d44e0318 100644
--- a/content/browser/dom_storage/session_storage_namespace_impl.h
+++ b/content/browser/dom_storage/session_storage_namespace_impl.h
@@ -34,11 +34,6 @@ class SessionStorageNamespaceImpl
   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;
@@ -48,15 +43,6 @@ class SessionStorageNamespaceImpl
   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;