Worklet: Move Worklet::Initialize() into ThreadedWorklet for cleanup

third_party/WebKit/Source/core/workers/Worklet.cpp

 // Copyright 2016 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.
 
 #include "core/workers/Worklet.h"
 
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
 
 namespace blink {
 
 Worklet::Worklet(LocalFrame* frame)
     : ContextLifecycleObserver(frame->GetDocument()), frame_(frame) {
   DCHECK(IsMainThread());
 }
 
 void Worklet::ContextDestroyed(ExecutionContext*) {
   DCHECK(IsMainThread());
-  if (IsInitialized())
-    GetWorkletGlobalScopeProxy()->TerminateWorkletGlobalScope();
   frame_ = nullptr;
 }
 
 DEFINE_TRACE(Worklet) {
   visitor->Trace(frame_);
   ContextLifecycleObserver::Trace(visitor);
 }
 
 }  // namespace blink