Rename DatabaseTaskSynchronizer to TaskSynchronizer and move it to platform/

Source/modules/webdatabase/DatabaseBackend.cpp

 /*
  * Copyright (C) 2013 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
 {
 }
 
 void DatabaseBackend::trace(Visitor* visitor)
 {
     DatabaseBackendBase::trace(visitor);
 }
 
 bool DatabaseBackend::openAndVerifyVersion(bool setVersionInNewDatabase, DatabaseError& error, String& errorMessage)
 {
-    DatabaseTaskSynchronizer synchronizer;
+    TaskSynchronizer synchronizer;
     if (!databaseContext()->databaseThread() || databaseContext()->databaseThread()->terminationRequested(&synchronizer))
         return false;
 
     DatabaseTracker::tracker().prepareToOpenDatabase(this);
     bool success = false;
     OwnPtr<DatabaseOpenTask> task = DatabaseOpenTask::create(this, setVersionInNewDatabase, &synchronizer, error, errorMessage, success);
     databaseContext()->databaseThread()->scheduleTask(task.release());
     synchronizer.waitForTaskCompletion();
 
     return success;
@@ skipping 93 matching lines @@
 {
     return databaseContext()->databaseThread()->transactionClient();
 }
 
 SQLTransactionCoordinator* DatabaseBackend::transactionCoordinator() const
 {
     return databaseContext()->databaseThread()->transactionCoordinator();
 }
 
 } // namespace WebCore