Make CFX_WideString::FromUTF8() take a CFX_ByteStringC argument.

fpdfsdk/jsapi/fxjs_v8.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 "fpdfsdk/include/jsapi/fxjs_v8.h"
 
 #include <vector>
 
@@ skipping 789 matching lines @@
   v8::Local<v8::Context> context = pIsolate->GetCurrentContext();
   return pValue->ToObject(context).ToLocalChecked();
 }
 
 CFX_WideString FXJS_ToString(v8::Isolate* pIsolate,
                              v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return L"";
   v8::Local<v8::Context> context = pIsolate->GetCurrentContext();
   v8::String::Utf8Value s(pValue->ToString(context).ToLocalChecked());
-  return CFX_WideString::FromUTF8(*s, s.length());
+  return CFX_WideString::FromUTF8(CFX_ByteStringC(*s, s.length()));
 }
 
 v8::Local<v8::Array> FXJS_ToArray(v8::Isolate* pIsolate,
                                   v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return v8::Local<v8::Array>();
   v8::Local<v8::Context> context = pIsolate->GetCurrentContext();
   return v8::Local<v8::Array>::Cast(pValue->ToObject(context).ToLocalChecked());
 }
 
 void FXJS_ValueCopy(v8::Local<v8::Value>& pTo, v8::Local<v8::Value> pFrom) {
   pTo = pFrom;
 }