Clean up singleton implementation

fpdfsdk/javascript/JS_GlobalData.h

Index: fpdfsdk/javascript/JS_GlobalData.h
diff --git a/fpdfsdk/javascript/JS_GlobalData.h b/fpdfsdk/javascript/JS_GlobalData.h
index 8273c0838c0371e7923069638c2d81afa23f6786..d901ec58b37460e4f6ef289ca3d3843b595b8130 100644
--- a/fpdfsdk/javascript/JS_GlobalData.h
+++ b/fpdfsdk/javascript/JS_GlobalData.h
@@ -11,49 +11,14 @@
 #include <vector>
 
 #include "core/fxcrt/include/fx_basic.h"
+#include "fpdfsdk/javascript/JS_KeyValue.h"
 
-#define JS_GLOBALDATA_TYPE_NUMBER 0
-#define JS_GLOBALDATA_TYPE_BOOLEAN 1
-#define JS_GLOBALDATA_TYPE_STRING 2
-#define JS_GLOBALDATA_TYPE_OBJECT 3
-#define JS_GLOBALDATA_TYPE_NULL 4
-
-class CJS_KeyValue;
 class CPDFDoc_Environment;
 
-class CJS_GlobalVariableArray {
- public:
-  CJS_GlobalVariableArray();
-  virtual ~CJS_GlobalVariableArray();
-
-  void Add(CJS_KeyValue* p);
-  int Count() const;
-  CJS_KeyValue* GetAt(int index) const;
-  void Copy(const CJS_GlobalVariableArray& array);
-
-  void Empty();
-
- private:
-  CFX_ArrayTemplate<CJS_KeyValue*> m_Array;
-};
-
-class CJS_KeyValue {
- public:
-  CJS_KeyValue();
-  virtual ~CJS_KeyValue();
-
-  CFX_ByteString sKey;
-  int nType;  // 0:int 1:bool 2:string 3:obj
-  double dData;
-  bool bData;
-  CFX_ByteString sData;
-  CJS_GlobalVariableArray objData;
-};
-
 class CJS_GlobalData_Element {
  public:
   CJS_GlobalData_Element() {}
-  virtual ~CJS_GlobalData_Element() {}
+  ~CJS_GlobalData_Element() {}
 
   CJS_KeyValue data;
   FX_BOOL bPersistent;
@@ -84,8 +49,6 @@ class CJS_GlobalData {
   using const_iterator =
       std::vector<std::unique_ptr<CJS_GlobalData_Element>>::const_iterator;
 
-  static CJS_GlobalData* g_Instance;
-
   CJS_GlobalData();
   ~CJS_GlobalData();