Merge TaskSynchronizer into WaitableEvent.

third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h

 /*
  * Copyright (C) 2007, 2008 Apple 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 22 matching lines @@
 #include "wtf/HashMap.h"
 #include "wtf/ThreadingPrimitives.h"
 #include <memory>
 
 namespace blink {
 
 class Database;
 class DatabaseTask;
 class SQLTransactionClient;
 class SQLTransactionCoordinator;
-class TaskSynchronizer;
+class WaitableEvent;
 
 class DatabaseThread : public GarbageCollectedFinalized<DatabaseThread> {
 public:
     static DatabaseThread* create() { return new DatabaseThread; }
     ~DatabaseThread();
     DECLARE_TRACE();
 
     // Callable only from the main thread.
     void start();
     void terminate();
@@ skipping 19 matching lines @@
 
     std::unique_ptr<WebThreadSupportingGC> m_thread;
 
     // This set keeps track of the open databases that have been used on this thread.
     // This must be updated in the database thread though it is constructed and
     // destructed in the context thread.
     HashSet<CrossThreadPersistent<Database>> m_openDatabaseSet;
 
     std::unique_ptr<SQLTransactionClient> m_transactionClient;
     CrossThreadPersistent<SQLTransactionCoordinator> m_transactionCoordinator;
-    TaskSynchronizer* m_cleanupSync;
+    WaitableEvent* m_cleanupSync;
 
     Mutex m_terminationRequestedMutex;
     bool m_terminationRequested;
 };
 
 } // namespace blink
 
 #endif // DatabaseThread_h