Merge TaskSynchronizer into WaitableEvent.

third_party/WebKit/Source/core/loader/WorkerThreadableLoader.cpp

 /*
  * Copyright (C) 2009, 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 234 matching lines @@
         m_workerLoaderProxy,
         wrapCrossThreadPersistent(m_workerGlobalScope->thread()->getWorkerThreadLifecycleContext()),
         request,
         m_threadableLoaderOptions,
         m_resourceLoaderOptions,
         eventWithTasks));
 
     if (m_blockingBehavior == LoadAsynchronously)
         return;
 
-    {
-        SafePointScope scope(BlinkGC::HeapPointersOnStack);
-        eventWithTasks->wait();
-    }
+    eventWithTasks->wait();
 
     if (eventWithTasks->isAborted()) {
         // This thread is going to terminate.
         cancel();
         return;
     }
 
     for (const auto& task : eventWithTasks->take()) {
         // Store the program counter where the task is posted from, and alias
         // it to ensure it is stored in the crash dump.
@@ skipping 330 matching lines @@
     const ResourceLoaderOptions& originalResourceLoaderOptions)
 {
     DCHECK(isMainThread());
     ResourceLoaderOptions resourceLoaderOptions = originalResourceLoaderOptions;
     resourceLoaderOptions.requestInitiatorContext = WorkerContext;
     m_mainThreadLoader = DocumentThreadableLoader::create(document, this, options, resourceLoaderOptions);
     m_mainThreadLoader->start(ResourceRequest(request.get()));
 }
 
 } // namespace blink