Revert of [worklets] Introduce ThreadedWorkletMessagingProxy and AnimationWorkletMessagaingProxy.

third_party/WebKit/Source/core/workers/ThreadedWorkletMessagingProxy.h

-// 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.
-
-#ifndef ThreadedWorkletMessagingProxy_h
-#define ThreadedWorkletMessagingProxy_h
-
-#include "core/CoreExport.h"
-#include "core/workers/ThreadedMessagingProxyBase.h"
-#include "core/workers/WorkletGlobalScopeProxy.h"
-
-namespace blink {
-
-class ThreadedWorkletObjectProxy;
-
-class CORE_EXPORT ThreadedWorkletMessagingProxy
-    : public ThreadedMessagingProxyBase
-    , public WorkletGlobalScopeProxy {
-public:
-    // WorkletGlobalScopeProxy implementation.
-    void evaluateScript(const ScriptSourceCode&) final;
-    void terminateWorkletGlobalScope() final;
-
-    void initialize();
-
-protected:
-    explicit ThreadedWorkletMessagingProxy(ExecutionContext*);
-
-    ThreadedWorkletObjectProxy& workletObjectProxy() { return *m_workletObjectProxy; }
-
-private:
-    std::unique_ptr<ThreadedWorkletObjectProxy> m_workletObjectProxy;
-};
-
-} // namespace blink
-
-#endif // ThreadedWorkletMessagingProxy_h