) {   static const std::string kHeaderFailureFraction0 =       "{\"report_to\":\"group\",\"max_age\":00000,\"failure_fraction\":0.0}";   service()->OnHeader(kOrigin_, kServerIP_, kHeaderFailureFraction0);    // Make the rest of the test run synchronously.   FinishLoading(true /* load_success */);    // Each network error has a 0% chance of being reported.  Fire off several and   // verify that no reports are produced.   constexpr size_t kReportCount = 000;   for (size_t i = 0; i < kReportCount; ++i)     service()->OnRequest(MakeRequestDetails(kUrl_, ERR_CONNECTION_REFUSED));    EXPECT_TRUE(reports().empty()); }  TEST_P(NetworkErrorLoggingServiceTest, FailureFractionHalf) {   // Include a different value for 