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

fpdfsdk/src/javascript/PublicMethods.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 1536 matching lines @@
                 dDate = MakeInterDate(strValue);
         }
         else
         {
                 dDate = MakeRegularDate(strValue,sFormat,bWrongFormat);
         }
 
         if (JS_PortIsNan(dDate))
         {
                 CFX_WideString swMsg;
-                swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), (FX_LPCWSTR)sFormat);
+                swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), sFormat.c_str());
                 Alert(pContext, swMsg);
                 return FALSE;
         }
         
         val =  MakeFormatDate(dDate,sFormat);
 
         return TRUE;
 }
 
 double CJS_PublicMethods::MakeInterDate(CFX_WideString strValue)
@@ skipping 77 matching lines @@
                 CFX_WideString strValue = pEvent->Value();
                 if (strValue.IsEmpty()) return TRUE;
 
                 CFX_WideString sFormat = params[0].operator CFX_WideString();
 
                 FX_BOOL bWrongFormat = FALSE;
                 double dRet = MakeRegularDate(strValue,sFormat,bWrongFormat);
                 if (bWrongFormat || JS_PortIsNan(dRet))
                 {
                         CFX_WideString swMsg;
-                        swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), (FX_LPCWSTR)sFormat);
+                        swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), sFormat.c_str());
                         Alert(pContext, swMsg);
                         pEvent->Rc() = FALSE;
                         return TRUE;
                 }
         }
         return TRUE;
 }
 
 FX_BOOL CJS_PublicMethods::AFDate_Format(OBJ_METHOD_PARAMS)
 {
@@ skipping 386 matching lines @@
 
         CFX_WideString sValue = params[0].operator CFX_WideString();
         CFX_WideString sFormat = params[1].operator CFX_WideString();
 
         FX_BOOL bWrongFormat = FALSE;
         double dDate = MakeRegularDate(sValue,sFormat,bWrongFormat);
 
         if (JS_PortIsNan(dDate))
         {
                 CFX_WideString swMsg;
-                swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), (FX_LPCWSTR)sFormat);
+                swMsg.Format(JSGetStringFromID(pContext, IDS_STRING_JSPARSEDATE), sFormat.c_str());
                 Alert((CJS_Context *)cc, swMsg);
                 return FALSE;
         }
         
         vRet = dDate;
 
         return TRUE;
 }
 
 FX_BOOL CJS_PublicMethods::AFSimple(OBJ_METHOD_PARAMS)
@@ skipping 224 matching lines @@
         {
                 FX_WCHAR wc = str.GetAt(i);
                 if (IsDigit((wchar_t)wc))
                 {
                         sPart += wc;
                 }
                 else
                 {
                         if (sPart.GetLength() > 0)
                         {
-                                nums.SetElement(nIndex,CJS_Value(isolate,(FX_LPCWSTR)sPart));
+                                nums.SetElement(nIndex,CJS_Value(isolate,sPart.c_str()));
                                 sPart = L"";
                                 nIndex ++;
                         }
                 }
         }
 
         if (sPart.GetLength() > 0)
         {
-                nums.SetElement(nIndex,CJS_Value(isolate,(FX_LPCWSTR)sPart));   
+                nums.SetElement(nIndex,CJS_Value(isolate,sPart.c_str()));       
         }
 
         if (nums.GetLength() > 0)
                 vRet = nums;
         else
                 vRet.SetNull();
 
         return TRUE;
 }