Move workers to Chromium threading

Source/core/workers/WorkerMessagingProxy.cpp

Index: Source/core/workers/WorkerMessagingProxy.cpp
diff --git a/Source/core/workers/WorkerMessagingProxy.cpp b/Source/core/workers/WorkerMessagingProxy.cpp
index 3a25fb18671e2d6d06ff58e92d702535d3eef0c8..e54726ab61bfd53f00343dc6096374f7ca86095c 100644
--- a/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/Source/core/workers/WorkerMessagingProxy.cpp
@@ -247,14 +247,14 @@ WorkerMessagingProxy::WorkerMessagingProxy(Worker* workerObject)
 {
     ASSERT(m_workerObject);
     ASSERT((m_scriptExecutionContext->isDocument() && isMainThread())
-           || (m_scriptExecutionContext->isWorkerContext() && currentThread() == static_cast<WorkerContext*>(m_scriptExecutionContext.get())->thread()->threadID()));
+           || (m_scriptExecutionContext->isWorkerContext() && static_cast<WorkerContext*>(m_scriptExecutionContext.get())->thread()->isCurrentThread()));
 }
 
 WorkerMessagingProxy::~WorkerMessagingProxy()
 {
     ASSERT(!m_workerObject);
     ASSERT((m_scriptExecutionContext->isDocument() && isMainThread())
-           || (m_scriptExecutionContext->isWorkerContext() && currentThread() == static_cast<WorkerContext*>(m_scriptExecutionContext.get())->thread()->threadID()));
+           || (m_scriptExecutionContext->isWorkerContext() && static_cast<WorkerContext*>(m_scriptExecutionContext.get())->thread()->isCurrentThread()));
 }
 
 void WorkerMessagingProxy::startWorkerContext(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode startMode)