Getting rid of more (FX_LPCWSTR) casts and fixing two bugs revealed by this.

fpdfsdk/src/javascript/global.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_Define.h"
 #include "../../include/javascript/JS_Object.h"
@@ skipping 323 matching lines @@
 
         v8::Local<v8::Context> context = pObj->CreationContext();
         v8::Isolate* isolate = context->GetIsolate();
 
         for (int i=0; i<nObjElements; i++)
         {
                 
                 CFX_WideString ws = JS_ToString(JS_GetArrayElemnet(pKeyList, i));
                 CFX_ByteString sKey = ws.UTF8Encode();
 
-                v8::Handle<v8::Value> v = JS_GetObjectElement(isolate, pObj, (FX_LPCWSTR)ws);
+                v8::Handle<v8::Value> v = JS_GetObjectElement(isolate, pObj, ws.c_str());
                 FXJSVALUETYPE vt = GET_VALUE_TYPE(v);
                 switch (vt)
                 {
                 case VT_number:
                         {
                                 CJS_KeyValue* pObjElement = new CJS_KeyValue;
                                 pObjElement->nType = JS_GLOBALDATA_TYPE_NUMBER;
                                 pObjElement->sKey = sKey;
                                 pObjElement->dData = JS_ToNumber(v);
                                 array.Add(pObjElement);
@@ skipping 186 matching lines @@
                 }
                 break;
         default:
                 return FALSE;
         }       
 
         m_mapGlobal.SetAt(propname, (FX_LPVOID)pNewData);
 
         return TRUE;
 }