[IndexedDB] Use consistent enums on both sides of IPC.

content/browser/indexed_db/indexed_db.h

 // Copyright (c) 2013 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_BROWSER_INDEXED_DB_INDEXED_DB_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_H_
 
 namespace content {
 
 namespace indexed_db {
 
-enum TransactionMode {
-  TRANSACTION_READ_ONLY = 0,
-  TRANSACTION_READ_WRITE = 1,
-  TRANSACTION_VERSION_CHANGE = 2
-};
-
-enum CursorDirection {
-  CURSOR_NEXT = 0,
-  CURSOR_NEXT_NO_DUPLICATE = 1,
-  CURSOR_PREV = 2,
-  CURSOR_PREV_NO_DUPLICATE = 3,
-};
-
 enum CursorType {
   CURSOR_KEY_AND_VALUE = 0,
   CURSOR_KEY_ONLY
 };
 
 }  // namespace indexed_db
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_H_