IndexedDB: Remove unused plumbing for string version changes

content/common/indexed_db/indexed_db_dispatcher.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_COMMON_INDEXED_DB_INDEXED_DB_DISPATCHER_H_
 #define CONTENT_COMMON_INDEXED_DB_INDEXED_DB_DISPATCHER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 232 matching lines @@
                        const IndexedDBDatabaseMetadata& metdata);
   void OnAbort(int32 ipc_thread_id,
                int32 ipc_database_id,
                int64 transaction_id,
                int code,
                const string16& message);
   void OnComplete(int32 ipc_thread_id,
                   int32 ipc_database_id,
                   int64 transaction_id);
   void OnForcedClose(int32 ipc_thread_id, int32 ipc_database_id);
-  void OnVersionChange(int32 ipc_thread_id,
-                       int32 ipc_database_id,
-                       const string16& newVersion);
   void OnIntVersionChange(int32 ipc_thread_id,
                           int32 ipc_database_id,
                           int64 old_version,
                           int64 new_version);
 
   // Reset cursor prefetch caches for all cursors except exception_cursor_id.
   void ResetCursorPrefetchCaches(int32 ipc_exception_cursor_id = -1);
 
   // Careful! WebIDBCallbacks wraps non-threadsafe data types. It must be
   // destroyed and used on the same thread it was created on.
   IDMap<WebKit::WebIDBCallbacks, IDMapOwnPointer> pending_callbacks_;
   IDMap<WebKit::WebIDBDatabaseCallbacks, IDMapOwnPointer>
       pending_database_callbacks_;
 
   // Map from cursor id to RendererWebIDBCursorImpl.
   std::map<int32, RendererWebIDBCursorImpl*> cursors_;
 
   std::map<int32, RendererWebIDBDatabaseImpl*> databases_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_INDEXED_DB_INDEXED_DB_DISPATCHER_H_