Revert of BackgroundHTMLParser: Introduce ParsedChunkQueue to pass ParsedChunks to main thread

third_party/WebKit/Source/core/html/parser/ParsedChunkQueue.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 ParsedChunkQueue_h
-#define ParsedChunkQueue_h
-
-#include "core/html/parser/HTMLDocumentParser.h"
-#include "wtf/Deque.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/ThreadingPrimitives.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-// ParsedChunkQueue is used to transfer parsed HTML token chunks
-// from BackgroundHTMLParser thread to Blink main thread without
-// spamming task queue.
-// ParsedChunkQueue is accessed from both BackgroundHTMLParser
-// thread (producer) and Blink main thread (consumer).
-// Access to the backend queue vector is protected by a mutex.
-// If enqueue is done against empty queue, BackgroundHTMLParser
-// thread kicks a consumer task on Blink main thread.
-class ParsedChunkQueue {
-public:
-    static PassOwnPtr<ParsedChunkQueue> create()
-    {
-        return adoptPtr(new ParsedChunkQueue);
-    }
-
-    bool enqueue(PassOwnPtr<HTMLDocumentParser::ParsedChunk>);
-    void clear();
-
-    void takeAll(Vector<OwnPtr<HTMLDocumentParser::ParsedChunk>>&);
-
-private:
-    ParsedChunkQueue();
-
-    Mutex m_mutex;
-    Vector<OwnPtr<HTMLDocumentParser::ParsedChunk>> m_pendingChunks;
-};
-
-} // namespace blink
-
-#endif