Remove dead code found by Scythe.

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 94 matching lines @@
 void CJS_ArrayBufferAllocator::Free(void* data, size_t length) {
     free(data);
 }
 
 /* ------------------------------ CJS_Runtime ------------------------------ */
 
 CJS_Runtime::CJS_Runtime(CPDFDoc_Environment * pApp) :
         m_pApp(pApp),
         m_pDocument(NULL),
         m_bBlocking(FALSE),
-        m_bRegistered(FALSE),
         m_pFieldEventPath(NULL),
         m_isolate(NULL)
 {
         if (m_pApp->GetFormFillInfo()->m_pJsPlatform->version >= 2) {
                 m_isolate = reinterpret_cast<v8::Isolate*>(m_pApp->GetFormFillInfo()->m_pJsPlatform->m_isolate);
         }
         if (!m_isolate) {
                 m_pArrayBufferAllocator.reset(new CJS_ArrayBufferAllocator());
 
                 v8::Isolate::CreateParams params;
@@ skipping 215 matching lines @@
 {
         return v8::Local<v8::Context>::New(m_isolate, m_context);
 }
 
 CFX_WideString ChangeObjName(const CFX_WideString& str)
 {
         CFX_WideString sRet = str;
         sRet.Replace(L"_", L".");
         return sRet;
 }