DOMStorageContextImpl that's implemented in terms of the new dom_storage classes.

webkit/dom_storage/dom_storage_area.h

Index: webkit/dom_storage/dom_storage_area.h
===================================================================
--- webkit/dom_storage/dom_storage_area.h	(revision 127221)
+++ webkit/dom_storage/dom_storage_area.h	(working copy)
@@ -27,6 +27,9 @@
     : public base::RefCountedThreadSafe<DomStorageArea> {
 
  public:
+  static const FilePath::CharType kDatabaseFileExtension[];
+  static FilePath DatabaseFileNameFromOrigin(const GURL& origin);
+
   DomStorageArea(int64 namespace_id,
                  const GURL& origin,
                  const FilePath& directory,
@@ -60,8 +63,6 @@
   void ScheduleCommitChanges();
   void CommitChanges();
 
-  static FilePath DatabaseFileNameFromOrigin(const GURL& origin);
-
   ~DomStorageArea();
 
   int64 namespace_id_;