Remove CFX_ThreadLock (its a no-op)

xfa/src/fgas/include/fx_utl.h

Index: xfa/src/fgas/include/fx_utl.h
diff --git a/xfa/src/fgas/include/fx_utl.h b/xfa/src/fgas/include/fx_utl.h
index c8d943e92072f56fe740d3be9de9b6746a93e685..f6c7c09f13fda8ccd85f4efe7153907d1f00d577 100644
--- a/xfa/src/fgas/include/fx_utl.h
+++ b/xfa/src/fgas/include/fx_utl.h
@@ -10,7 +10,6 @@
 #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;
@@ -36,13 +35,6 @@ 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);