Revert of Reimplement automation API on top of C++-backed AXTree.

extensions/renderer/logging_native_handler.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_LOGGING_NATIVE_HANDLER_H_
 #define EXTENSIONS_RENDERER_LOGGING_NATIVE_HANDLER_H_
 
 #include <string>
 
 #include "extensions/renderer/object_backed_native_handler.h"
@@ skipping 28 matching lines @@
   void Log(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   // Equivalent to LOG(WARNING) << message.
   //
   // void(message)
   void Warning(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   void ParseArgs(const v8::FunctionCallbackInfo<v8::Value>& args,
                  bool* check_value,
                  std::string* error_message);
+
+  std::string ToStringOrDefault(const v8::Local<v8::String>& v8_string,
+                                const std::string& dflt);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_LOGGING_NATIVE_HANDLER_H_