Add toWebCoreString() / toWebCoreAtomicString() overloads taking a v8::String

Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp

 /*
  * Copyright (C) 2007-2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
     for (size_t i = 0; i < itemArray->Length(); ++i) {
         v8::Local<v8::Object> item = v8::Local<v8::Object>::Cast(itemArray->Get(i));
         v8::Local<v8::Value> type = item->Get(v8::String::NewSymbol("type"));
         v8::Local<v8::Value> id = item->Get(v8::String::NewSymbol("id"));
         v8::Local<v8::Value> label = item->Get(v8::String::NewSymbol("label"));
         v8::Local<v8::Value> enabled = item->Get(v8::String::NewSymbol("enabled"));
         v8::Local<v8::Value> checked = item->Get(v8::String::NewSymbol("checked"));
         v8::Local<v8::Value> subItems = item->Get(v8::String::NewSymbol("subItems"));
         if (!type->IsString())
             continue;
-        String typeString = toWebCoreStringWithNullCheck(type);
+        String typeString = toWebCoreStringWithNullCheck(type.As<v8::String>());
         if (typeString == "separator") {
             ContextMenuItem item(ContextMenuItem(SeparatorType,
                                  ContextMenuItemCustomTagNoAction,
                                  String()));
             menu.appendItem(item);
         } else if (typeString == "subMenu" && subItems->IsArray()) {
             ContextMenu subMenu;
             v8::Local<v8::Array> subItemsArray = v8::Local<v8::Array>::Cast(subItems);
             populateContextMenuItems(subItemsArray, subMenu);
             ContextMenuItem item(SubmenuType,
@@ skipping 55 matching lines @@
     histogramEnumeration("DevTools.PanelShown", args, 20);
 }
 
 void V8InspectorFrontendHost::recordSettingChangedMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     histogramEnumeration("DevTools.SettingChanged", args, 100);
 }
 
 } // namespace WebCore