Remove Clone() from CannedBrowsingData*Helper classes

chrome/browser/browsing_data/browsing_data_indexed_db_helper.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 CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 78 matching lines @@
 
     bool operator<(const PendingIndexedDBInfo& other) const;
 
     GURL origin;
     base::string16 name;
   };
 
   explicit CannedBrowsingDataIndexedDBHelper(
       content::IndexedDBContext* context);
 
-  // Return a copy of the IndexedDB helper. Only one consumer can use the
-  // StartFetching method at a time, so we need to create a copy of the helper
-  // every time we instantiate a cookies tree model for it.
-  CannedBrowsingDataIndexedDBHelper* Clone();
-
   // Add a indexed database to the set of canned indexed databases that is
   // returned by this helper.
   void AddIndexedDB(const GURL& origin,
                     const base::string16& name);
 
   // Clear the list of canned indexed databases.
   void Reset();
 
   // True if no indexed databases are currently stored.
   bool empty() const;
@@ skipping 13 matching lines @@
 
  private:
   virtual ~CannedBrowsingDataIndexedDBHelper();
 
   std::set<PendingIndexedDBInfo> pending_indexed_db_info_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataIndexedDBHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_INDEXED_DB_HELPER_H_