HasOptionalArgument 2165 chrome/browser/extensions/api/web_request/web_request_api.cc   if (HasOptionalArgument(2)) {
HasOptionalArgument 2262 chrome/browser/extensions/api/web_request/web_request_api.cc   if (HasOptionalArgument(3)) {
HasOptionalArgument  218 extensions/browser/extension_function.h   bool HasOptionalArgument(size_t index);