Rename DatabaseTaskSynchronizer to TaskSynchronizer and move it to platform/

Source/modules/webdatabase/DatabaseContext.h

 /*
  * 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 20 matching lines @@
 #include "core/dom/ActiveDOMObject.h"
 #include "heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/ThreadSafeRefCounted.h"
 
 namespace WebCore {
 
 class Database;
 class DatabaseBackendBase;
 class DatabaseContext;
-class DatabaseTaskSynchronizer;
+class TaskSynchronizer;
 class DatabaseThread;
 class ExecutionContext;
 class SecurityOrigin;
 
 class DatabaseContext FINAL : public ThreadSafeRefCounted<DatabaseContext>, public ActiveDOMObject {
 public:
     friend class DatabaseManager;
 
     static PassRefPtr<DatabaseContext> create(ExecutionContext*);
 
@@ skipping 27 matching lines @@
     // DatabaseBackendSync is always closed before destruction.
     HashSet<DatabaseBackendBase*> m_openSyncDatabases;
     bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
     bool m_isRegistered;
     bool m_hasRequestedTermination;
 };
 
 } // namespace WebCore
 
 #endif // DatabaseContext_h