Use enum for per thread heap enabled flag

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

 /*
  * Copyright (C) 2007, 2008, 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
@@ skipping 47 matching lines @@
 
 DEFINE_TRACE(DatabaseThread)
 {
 }
 
 void DatabaseThread::start()
 {
     ASSERT(isMainThread());
     if (m_thread)
         return;
-    m_thread = WebThreadSupportingGC::create("WebCore: Database", true);
+    m_thread = WebThreadSupportingGC::create("WebCore: Database", BlinkGC::PerThreadHeapMode);
     m_thread->postTask(BLINK_FROM_HERE, crossThreadBind(&DatabaseThread::setupDatabaseThread, wrapCrossThreadPersistent(this)));
 }
 
 void DatabaseThread::setupDatabaseThread()
 {
     m_thread->initialize();
     m_transactionCoordinator = new SQLTransactionCoordinator();
 }
 
 void DatabaseThread::terminate()
@@ skipping 91 matching lines @@
     {
         MutexLocker lock(m_terminationRequestedMutex);
         ASSERT(!m_terminationRequested);
     }
 #endif
     // WebThread takes ownership of the task.
     m_thread->postTask(BLINK_FROM_HERE, crossThreadBind(&DatabaseTask::run, std::move(task)));
 }
 
 } // namespace blink