Issue 6526 - Remove deprecated Utf8Value() usage

src/JsError.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef ADBLOCK_PLUS_JS_ERROR_H
 #define ADBLOCK_PLUS_JS_ERROR_H
 
 #include <sstream>
 #include <stdexcept>
 #include <v8.h>
 
 namespace AdblockPlus
 {
   class JsError : public std::runtime_error
   {
   public:
-    JsError(const v8::Local<v8::Value>& exception,
+    JsError(v8::Isolate* isolate, const v8::Local<v8::Value>& exception,
             const v8::Local<v8::Message>& message);
-    static std::string ExceptionToString(const v8::Local<v8::Value>& exception,
+    static std::string ExceptionToString(v8::Isolate* isolate,
+      const v8::Local<v8::Value>& exception,
       const v8::Local<v8::Message>& message);
 
   };
 }
 
 #endif