Remove CFX_ThreadLock (its a no-op)

xfa/src/fgas/include/fx_utl.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef XFA_SRC_FGAS_INCLUDE_FX_UTL_H_
 #define XFA_SRC_FGAS_INCLUDE_FX_UTL_H_
 
 #include "xfa/src/fgas/include/fx_mem.h"
 #include "core/include/fxcrt/fx_coordinates.h"  // For CFX_Rect.
 
-class CFX_ThreadLock;
 class CFX_BaseArray;
 template <class baseType>
 class CFX_BaseArrayTemplate;
 template <class baseType>
 class CFX_ObjectBaseArrayTemplate;
 class CFX_BaseMassArray;
 class CFX_BaseMassArrayImp;
 template <class baseType>
 class CFX_MassArrayTemplate;
 template <class baseType>
 class CFX_ObjectMassArrayTemplate;
 class CFX_BaseDiscreteArray;
 template <class baseType>
 class CFX_DiscreteArrayTemplate;
 class CFX_BaseStack;
 template <class baseType>
 class CFX_StackTemplate;
 template <class baseType>
 class CFX_ObjectStackTemplate;
 template <class baseType>
 class CFX_CPLTreeNode;
 template <class baseType>
 class CFX_CPLTree;
 class FX_BASEARRAYDATA;
 
-class CFX_ThreadLock {
- public:
-  CFX_ThreadLock();
-  virtual ~CFX_ThreadLock();
-  void Lock();
-  void Unlock();
-};
 class CFX_BaseArray : public CFX_Target {
  protected:
   CFX_BaseArray(int32_t iGrowSize, int32_t iBlockSize);
   ~CFX_BaseArray();
   int32_t GetSize() const;
   int32_t GetBlockSize() const;
   uint8_t* AddSpaceTo(int32_t index);
   uint8_t* GetAt(int32_t index) const;
   uint8_t* GetBuffer() const;
   int32_t Append(const CFX_BaseArray& src,
@@ skipping 660 matching lines @@
       pLast->SetNextNode(pChild);
     }
     return pChild;
   }
 
  protected:
   CPLTreeNode m_Root;
 };
 
 #endif  // XFA_SRC_FGAS_INCLUDE_FX_UTL_H_