Enable per thread heap for database thread

third_party/WebKit/Source/modules/webdatabase/sqlite/SQLiteDatabase.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
  *
  * 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 383 matching lines @@
     case AutoVacuumNone:
     default:
         if (!executeCommand("PRAGMA auto_vacuum = 2"))
             return false;
         runVacuumCommand();
         error = lastError();
         return (error == SQLITE_OK);
     }
 }
 
-DEFINE_TRACE(SQLiteDatabase)
-{
-    visitor->trace(m_authorizer);
-}
-
 } // namespace blink