message: Fix NetworkEmulationManagerTest.ThroughputStats flakiness (again).
  This CL increases tolerance for time measurement variability,
  from 1% to 5%. This accounts for heavily loaded bots in CI.
  Cr-Commit-Position: refs/heads/master@{#29765}
diff: @@ -315,7 +315,7 @@ TEST(NetworkEmulationManagerTest, ThroughputStats) {
  EXPECT_EQ(st.packets_sent, kNumPacketsSent);
  EXPECT_EQ(st.bytes_sent.bytes(), kSinglePacketSize * kNumPacketsSent);
  - const double tolerance = 0.99; // Accept 1% tolerance for timing.
  + const double tolerance = 0.95; // Accept 5% tolerance for timing.
  EXPECT_GE(st.last_packet_sent_time - st.first_packet_sent_time,
  TimeDelta::ms((kNumPacketsSent - 1) * kDelayMs * tolerance));
  EXPECT_GT(st.AverageSendRate().bps(), 0);
  