Unify logic of stack trace generation for extension errors

extensions/renderer/safe_builtins.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_RENDERER_SAFE_BUILTINS_H_
 #define EXTENSIONS_RENDERER_SAFE_BUILTINS_H_
 
 #include "v8/include/v8.h"
 
 namespace extensions {
@@ skipping 18 matching lines @@
   //   Object.prototype.toString.call(...) becomes Object.toString(...)
   //   Object.keys.call(...) becomes Object.keys(...)
   v8::Local<v8::Object> GetArray() const;
   v8::Local<v8::Object> GetFunction() const;
   v8::Local<v8::Object> GetJSON() const;
   // NOTE(kalman): VS2010 won't compile "GetObject", it mysteriously renames it
   // to "GetObjectW" - hence GetObjekt. Sorry.
   v8::Local<v8::Object> GetObjekt() const;
   v8::Local<v8::Object> GetRegExp() const;
   v8::Local<v8::Object> GetString() const;
+  v8::Local<v8::Object> GetError() const;
 
  private:
   ScriptContext* context_;
 };
 
 }  //  namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SAFE_BUILTINS_H_