workers: Rename WorkerThread to WorkerScript.

Source/core/workers/DedicatedWorkerMessagingProxy.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DedicatedWorkerMessagingProxy_h
 #define DedicatedWorkerMessagingProxy_h
 
 #include "core/CoreExport.h"
 #include "core/workers/WorkerMessagingProxy.h"
 
 namespace blink {
 
 class CORE_EXPORT DedicatedWorkerMessagingProxy final : public WorkerMessagingProxy {
     WTF_MAKE_NONCOPYABLE(DedicatedWorkerMessagingProxy);
     WTF_MAKE_FAST_ALLOCATED(WorkerMessagingProxy);
 public:
     DedicatedWorkerMessagingProxy(InProcessWorkerBase*, PassOwnPtrWillBeRawPtr<WorkerClients>);
     virtual ~DedicatedWorkerMessagingProxy();
 
-    PassRefPtr<WorkerThread> createWorkerThread(double originTime, PassOwnPtr<WorkerThreadStartupData>) override;
+    PassRefPtr<WorkerScript> createWorkerScript(double originTime, PassOwnPtr<WorkerScriptStartupData>) override;
 };
 
 } // namespace blink
 
 #endif // DedicatedWorkerMessagingProxy_h