Change from 'this' to L'this' and remove the cast that was hiding this mismatch.

fpdfsdk/src/javascript/JS_Runtime.cpp

 // 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
 
 #include "../../include/javascript/JavaScript.h"
 #include "../../include/javascript/IJavaScript.h"
 #include "../../include/javascript/JS_EventHandler.h"
 #include "../../include/javascript/JS_Runtime.h"
@@ skipping 331 matching lines @@
         array.Add(CJS_Display::m_pClassName);
         array.Add(CJS_Font::m_pClassName);
         array.Add(CJS_Highlight::m_pClassName);
         array.Add(CJS_Position::m_pClassName);
         array.Add(CJS_ScaleHow::m_pClassName);
         array.Add(CJS_ScaleWhen::m_pClassName);
         array.Add(CJS_Style::m_pClassName);
         array.Add(CJS_Zoomtype::m_pClassName);
 
         array.Add(CJS_App::m_pClassName);
-        array.Add((FX_LPCWSTR)"this"); 
+        array.Add(L"this");
         array.Add(CJS_Event::m_pClassName);     
 
         array.Add(CJS_Global::m_pClassName);    
         array.Add(CJS_Util::m_pClassName);
 }
 
 void CJS_Runtime::GetObjectConsts(const CFX_WideString& sObjName, CFX_WideStringArray& array)
 {
         JSConstSpec* pConsts = NULL;
         int nSize = 0;
@@ skipping 106 matching lines @@
         return v8::Isolate::GetCurrent() == m_isolate;
 }
 void    CJS_Runtime::Exit()
 {
         if(m_isolate) m_isolate->Exit();
 }
 void    CJS_Runtime::Enter()
 {
         if(m_isolate) m_isolate->Enter();
 }