Decouple lifetime of database thread and WebDatabase, chromium side.

content/child/web_database_observer_impl.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_CHILD_WEB_DATABASE_OBSERVER_IMPL_H_
 #define CONTENT_CHILD_WEB_DATABASE_OBSERVER_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "third_party/WebKit/public/web/WebDatabaseObserver.h"
 #include "webkit/common/database/database_connections.h"
 
+namespace WebKit {
+class WebString;
+}
+
 namespace content {
 
 class WebDatabaseObserverImpl : public WebKit::WebDatabaseObserver {
  public:
   explicit WebDatabaseObserverImpl(IPC::SyncMessageFilter* sender);
   virtual ~WebDatabaseObserverImpl();
 
   virtual void databaseOpened(const WebKit::WebDatabase& database) OVERRIDE;
   virtual void databaseModified(const WebKit::WebDatabase& database) OVERRIDE;
-  virtual void databaseClosed(const WebKit::WebDatabase& database) OVERRIDE;
+  virtual void databaseClosed(const WebKit::WebString& origin_identifier,
+                              const WebKit::WebString& database_name);
+  // TODO(jochen): Remove this version once the blink side has rolled.
+  virtual void databaseClosed(const WebKit::WebDatabase& database);
 
   virtual void reportOpenDatabaseResult(
       const WebKit::WebDatabase& database, int callsite,
       int websql_error, int sqlite_error) OVERRIDE;
   virtual void reportChangeVersionResult(
       const WebKit::WebDatabase& database, int callsite,
       int websql_error, int sqlite_error) OVERRIDE;
   virtual void reportStartTransactionResult(
       const WebKit::WebDatabase& database, int callsite,
       int websql_error, int sqlite_error) OVERRIDE;
@@ skipping 11 matching lines @@
  private:
   void HandleSqliteError(const WebKit::WebDatabase& database, int error);
 
   scoped_refptr<IPC::SyncMessageFilter> sender_;
   scoped_refptr<webkit_database::DatabaseConnectionsWrapper> open_connections_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEB_DATABASE_OBSERVER_IMPL_H_