Make IndexedDBConnection IDs independent from the IPC database ID.

content/browser/indexed_db/indexed_db_database_callbacks.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_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 16 matching lines @@
       int32_t ipc_thread_id,
       ::indexed_db::mojom::DatabaseCallbacksAssociatedPtrInfo callbacks_info);
 
   virtual void OnForcedClose();
   virtual void OnVersionChange(int64_t old_version, int64_t new_version);
 
   virtual void OnAbort(int64_t host_transaction_id,
                        const IndexedDBDatabaseError& error);
   virtual void OnComplete(int64_t host_transaction_id);
   virtual void OnDatabaseChange(
-      int32_t ipc_database_id,
       std::unique_ptr<IndexedDBObserverChanges> changes);
 
  protected:
   virtual ~IndexedDBDatabaseCallbacks();
 
  private:
   friend class base::RefCounted<IndexedDBDatabaseCallbacks>;
 
   class IOThreadHelper;
 
   scoped_refptr<IndexedDBDispatcherHost> dispatcher_host_;
   int32_t ipc_thread_id_;
   std::unique_ptr<IOThreadHelper, BrowserThread::DeleteOnIOThread> io_helper_;
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabaseCallbacks);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_CALLBACKS_H_