Remove some abstractions in fxjs_v8.h.

fpdfsdk/include/javascript/JS_Runtime.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 FPDFSDK_INCLUDE_JAVASCRIPT_JS_RUNTIME_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_JS_RUNTIME_H_
 
 #include "../../../third_party/base/nonstd_unique_ptr.h"
@@ skipping 22 matching lines @@
   CJS_Runtime(CPDFDoc_Environment* pApp);
   ~CJS_Runtime() override;
 
   // IFXJS_Runtime
   IFXJS_Context* NewContext() override;
   void ReleaseContext(IFXJS_Context* pContext) override;
   IFXJS_Context* GetCurrentContext() override;
   void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override;
   CPDFSDK_Document* GetReaderDocument() override { return m_pDocument; }
 
-  CPDFDoc_Environment* GetReaderApp() { return m_pApp; }
+  CPDFDoc_Environment* GetReaderApp() const { return m_pApp; }
 
   FX_BOOL InitJSObjects();
 
   FX_BOOL AddEventToLoop(const CFX_WideString& sTargetName,
                          JS_EVENT_T eEventType);
   void RemoveEventInLoop(const CFX_WideString& sTargetName,
                          JS_EVENT_T eEventType);
   void RemoveEventsInLoop(CJS_FieldEvent* pStart);
 
   void BeginBlock() { m_bBlocking = TRUE; }
   void EndBlock() { m_bBlocking = FALSE; }
-  FX_BOOL IsBlocking() { return m_bBlocking; }
+  FX_BOOL IsBlocking() const { return m_bBlocking; }
 
-  operator IJS_Runtime*() { return (IJS_Runtime*)m_isolate; }
-  v8::Isolate* GetIsolate() { return m_isolate; }
-  void SetIsolate(v8::Isolate* isolate) { m_isolate = isolate; }
-
+  v8::Isolate* GetIsolate() const { return m_isolate; }
   v8::Local<v8::Context> NewJSContext();
 
  protected:
   CFX_ArrayTemplate<CJS_Context*> m_ContextArray;
   CPDFDoc_Environment* m_pApp;
   CPDFSDK_Document* m_pDocument;
   FX_BOOL m_bBlocking;
   CJS_FieldEvent* m_pFieldEventPath;
-
   v8::Isolate* m_isolate;
   bool m_isolateManaged;
   nonstd::unique_ptr<CJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
   v8::Global<v8::Context> m_context;
 };
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_JS_RUNTIME_H_