Simplify memory management for per isolate data

fxjs/include/fxjs_v8.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
 
 // FXJS_V8 is a layer that makes it easier to define native objects in V8, but
 // has no knowledge of PDF-specific native objects. It could in theory be used
 // to implement other sets of native objects.
 
@@ skipping 82 matching lines @@
   MapType m_map;
 };
 
 class FXJS_PerIsolateData {
  public:
   ~FXJS_PerIsolateData();
 
   static void SetUp(v8::Isolate* pIsolate);
   static FXJS_PerIsolateData* Get(v8::Isolate* pIsolate);
 
-  void CreateDynamicObjsMap(v8::Isolate* pIsolate) {
-    if (!m_pDynamicObjsMap)
-      m_pDynamicObjsMap = new V8TemplateMap(pIsolate);
-  }
-  void ReleaseDynamicObjsMap() {
-    delete m_pDynamicObjsMap;
-    m_pDynamicObjsMap = nullptr;
-  }
-
-  std::vector<CFXJS_ObjDefinition*> m_ObjectDefnArray;
+  std::vector<std::unique_ptr<CFXJS_ObjDefinition>> m_ObjectDefnArray;
 #ifdef PDF_ENABLE_XFA
   std::unique_ptr<CFXJSE_RuntimeData> m_pFXJSERuntimeData;
 #endif  // PDF_ENABLE_XFA
-  V8TemplateMap* m_pDynamicObjsMap;
+  std::unique_ptr<V8TemplateMap> m_pDynamicObjsMap;
 
  protected:
-  FXJS_PerIsolateData();
+  explicit FXJS_PerIsolateData(v8::Isolate* pIsolate);
 };
 
 class FXJS_ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   void* Allocate(size_t length) override;
   void* AllocateUninitialized(size_t length) override;
   void Free(void* data, size_t length) override;
 };
 
 void FXJS_Initialize(unsigned int embedderDataSlot, v8::Isolate* pIsolate);
 void FXJS_Release();
@@ skipping 132 matching lines @@
   void SetIsolate(v8::Isolate* pIsolate) { m_isolate = pIsolate; }
 
  private:
   v8::Isolate* m_isolate;
   v8::Global<v8::Context> m_V8PersistentContext;
   std::vector<v8::Global<v8::Object>*> m_StaticObjects;
   std::map<CFX_WideString, v8::Global<v8::Array>> m_ConstArrays;
 };
 
 #endif  // FXJS_INCLUDE_FXJS_V8_H_