Merge V8 API updates to xfa branch

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 _JS_RUNTIME_H_
 #define _JS_RUNTIME_H_
 
 #include "../../../third_party/base/nonstd_unique_ptr.h"
@@ skipping 40 matching lines @@
         void                                                                    RemoveEventsInLoop(CJS_FieldEvent* pStart);
 
         void                                                                    BeginBlock(){m_bBlocking = TRUE;}
         void                                                                    EndBlock(){m_bBlocking = FALSE;}
         FX_BOOL                                                                 IsBlocking(){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::Handle<v8::Context>                                 NewJSContext();
+        v8::Local<v8::Context>                                  NewJSContext();
 
 
         virtual FX_BOOL                                                 GetHValueByName(FX_BSTR utf8Name, FXJSE_HVALUE hValue);
         virtual FX_BOOL                                                 SetHValueByName(FX_BSTR utf8Name, FXJSE_HVALUE hValue);
 protected:
         CFX_ArrayTemplate<CJS_Context*>         m_ContextArray;
         CPDFDoc_Environment*                                                    m_pApp;
         CPDFSDK_Document*                                               m_pDocument;
         FX_BOOL                                                                 m_bBlocking;
         FX_BOOL                                                                 m_bRegistered;
         CJS_FieldEvent*                                                 m_pFieldEventPath;
 
         v8::Isolate* m_isolate;
         nonstd::unique_ptr<CJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
-        v8::Persistent<v8::Context> m_context;
+        v8::Global<v8::Context> m_context;
 };
 
 #endif //_JS_RUNTIME_H_