Remove threading primitives from ParseHTMLOnMainThread

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/PassRefPtr.h"
@@ skipping 24 matching lines @@
     bool enqueue(std::unique_ptr<HTMLDocumentParser::ParsedChunk>);
     void clear();
 
     void takeAll(Vector<std::unique_ptr<HTMLDocumentParser::ParsedChunk>>&);
     size_t peakPendingChunkCount();
     size_t peakPendingTokenCount();
 
 private:
     ParsedChunkQueue();
 
-    Mutex m_mutex;
+    std::unique_ptr<Mutex> m_mutex;
     Vector<std::unique_ptr<HTMLDocumentParser::ParsedChunk>> m_pendingChunks;
     size_t m_peakPendingChunkCount = 0;
     size_t m_peakPendingTokenCount = 0;
     size_t m_pendingTokenCount = 0;
 };
 
 } // namespace blink
 
 #endif