Make IndexedDBConnection IDs independent from the IPC database ID.

content/browser/indexed_db/indexed_db_connection.h

 // Copyright 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_CONNECTION_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CONNECTION_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 20 matching lines @@
 
   void VersionChangeIgnored();
 
   virtual void ActivatePendingObservers(
       std::vector<std::unique_ptr<IndexedDBObserver>> pending_observers);
   // Removes observer listed in |remove_observer_ids| from active_observer of
   // connection or pending_observer of transactions associated with this
   // connection.
   virtual void RemoveObservers(const std::vector<int32_t>& remove_observer_ids);
 
-  void set_id(int32_t id);
   int32_t id() const { return id_; }
 
   IndexedDBDatabase* database() const { return database_.get(); }
   IndexedDBDatabaseCallbacks* callbacks() const { return callbacks_.get(); }
   const std::vector<std::unique_ptr<IndexedDBObserver>>& active_observers()
       const {
     return active_observers_;
   }
   base::WeakPtr<IndexedDBConnection> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
 
  private:
-  enum { kInvalidId = -1 };
-  // id_ is ipc_database_id
-  int32_t id_ = kInvalidId;
+  const int32_t id_;
 
   // NULL in some unit tests, and after the connection is closed.
   scoped_refptr<IndexedDBDatabase> database_;
 
   // The callbacks_ member is cleared when the connection is closed.
   // May be NULL in unit tests.
   scoped_refptr<IndexedDBDatabaseCallbacks> callbacks_;
   std::vector<std::unique_ptr<IndexedDBObserver>> active_observers_;
   base::WeakPtrFactory<IndexedDBConnection> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBConnection);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CONNECTION_H_