Indexed DB: Remove experimental delete-returns-count change

content/browser/indexed_db/indexed_db_database.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_DATABASE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 334 matching lines @@
   // This holds open or delete requests that are waiting for the active
   // request to be completed. The requests have not yet broadcast
   // OnVersionChange (if necessary).
   std::queue<std::unique_ptr<ConnectionRequest>> pending_requests_;
 
   // The |processing_pending_requests_| flag is set while ProcessRequestQueue()
   // is executing. It prevents rentrant calls if the active request completes
   // synchronously.
   bool processing_pending_requests_ = false;
 
-  bool experimental_web_platform_features_enabled_;
-
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_