IndexedDB: Remove unused plumbing for string version changes

content/common/indexed_db/indexed_db_messages.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.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include <vector>
 
 #include "content/common/indexed_db/indexed_db_key.h"
 #include "content/common/indexed_db/indexed_db_key_path.h"
@@ skipping 336 matching lines @@
                      int32, /* ipc_thread_id */
                      int32, /* ipc_response_id */
                      int32, /* ipc_database_id */
                      int64, /* old_version */
                      IndexedDBDatabaseMetadata) /* metadata */
 
 // IDBDatabaseCallback message handlers
 IPC_MESSAGE_CONTROL2(IndexedDBMsg_DatabaseCallbacksForcedClose,
                      int32, /* ipc_thread_id */
                      int32) /* ipc_database_id */
-IPC_MESSAGE_CONTROL3(IndexedDBMsg_DatabaseCallbacksVersionChange,
-                     int32, /* ipc_thread_id */
-                     int32, /* ipc_database_id */
-                     string16) /* new_version */
-
 IPC_MESSAGE_CONTROL4(IndexedDBMsg_DatabaseCallbacksIntVersionChange,
                      int32, /* ipc_thread_id */
                      int32, /* ipc_database_id */
                      int64, /* old_version */
                      int64) /* new_version */
 IPC_MESSAGE_CONTROL5(IndexedDBMsg_DatabaseCallbacksAbort,
                      int32, /* ipc_thread_id */
                      int32, /* ipc_database_id */
                      int64, /* transaction_id */
                      int, /* code */
@@ skipping 129 matching lines @@
 
 // WebIDBDatabase::commit() message.
 IPC_MESSAGE_CONTROL2(IndexedDBHostMsg_DatabaseCommit,
                      int32, /* ipc_database_id */
                      int64) /* transaction_id */
 
 // WebIDBDatabase::~WebIDBCursor() message.
 IPC_MESSAGE_CONTROL1(IndexedDBHostMsg_CursorDestroyed,
                      int32 /* ipc_cursor_id */)