Remove modules/webdatabase dependency from core.

Source/modules/webdatabase/DatabaseContext.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 113 matching lines @@
 // To do this, we stop the database and let everything shutdown naturally
 // because the database closing process may still make use of this context.
 // It is not safe to just delete the context here.
 void DatabaseContext::contextDestroyed()
 {
     stopDatabases();
     ActiveDOMObject::contextDestroyed();
     deref(); // paired with the ref() call on create().
 }
 
+void DatabaseContext::willStop()
+{
+    DatabaseManager::manager().interruptAllDatabasesForContext(this);
+}
+
 // stop() is from stopActiveDOMObjects() which indicates that the owner LocalFrame
 // or WorkerThread is shutting down. Initiate the orderly shutdown by stopping
 // the associated databases.
 void DatabaseContext::stop()
 {
     stopDatabases();
 }
 
 PassRefPtr<DatabaseContext> DatabaseContext::backend()
 {
@@ skipping 91 matching lines @@
 {
     return executionContext()->securityOrigin();
 }
 
 bool DatabaseContext::isContextThread() const
 {
     return executionContext()->isContextThread();
 }
 
 } // namespace WebCore