Remove calls to deprecated toWebCoreStringWithNullCheck(v8::Handle<v8::Value>)

Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp

Index: Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp
diff --git a/Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp b/Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp
index 6b1b38dd2be1c48351805453fa8d59a311120837..394524b9719ff09ed07593c4095059fd7f2d46ae 100644
--- a/Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp
+++ b/Source/bindings/v8/custom/V8InspectorFrontendHostCustom.cpp
@@ -88,7 +88,8 @@ static bool populateContextMenuItems(v8::Local<v8::Array>& itemArray, ContextMen
             menu.appendItem(item);
         } else {
             ContextMenuAction typedId = static_cast<ContextMenuAction>(ContextMenuItemBaseCustomTag + id->ToInt32()->Value());
-            ContextMenuItem menuItem((typeString == "checkbox" ? CheckableActionType : ActionType), typedId, toWebCoreStringWithNullCheck(label));
+            V8TRYCATCH_FOR_V8STRINGRESOURCE_RETURN(V8StringResource<WithNullCheck>, labelString, label, false);
+            ContextMenuItem menuItem((typeString == "checkbox" ? CheckableActionType : ActionType), typedId, labelString);
             if (checked->IsBoolean())
                 menuItem.setChecked(checked->ToBoolean()->Value());
             if (enabled->IsBoolean())