Use overloaded operators with QuicTime for addition, subtraction and scalar

net/tools/quic/test_tools/quic_test_client.cc

Index: net/tools/quic/test_tools/quic_test_client.cc
diff --git a/net/tools/quic/test_tools/quic_test_client.cc b/net/tools/quic/test_tools/quic_test_client.cc
index 651adf8c30955ed620d2cf0be0b4740d8c7e16eb..ad5748d8185a4fd91a481a0702db582ee0cee5e1 100644
--- a/net/tools/quic/test_tools/quic_test_client.cc
+++ b/net/tools/quic/test_tools/quic_test_client.cc
@@ -496,7 +496,7 @@ void QuicTestClient::WaitForResponseForMs(int timeout_ms) {
       QuicConnectionPeer::GetHelper(client()->session()->connection())
           ->GetClock();
   QuicTime end_waiting_time =
-      clock->Now().Add(QuicTime::Delta::FromMicroseconds(timeout_us));
+      clock->Now() + QuicTime::Delta::FromMicroseconds(timeout_us);
   while (HaveActiveStream() &&
          (timeout_us < 0 || clock->Now() < end_waiting_time)) {
     client_->WaitForEvents();
@@ -516,7 +516,7 @@ void QuicTestClient::WaitForInitialResponseForMs(int timeout_ms) {
       QuicConnectionPeer::GetHelper(client()->session()->connection())
           ->GetClock();
   QuicTime end_waiting_time =
-      clock->Now().Add(QuicTime::Delta::FromMicroseconds(timeout_us));
+      clock->Now() + QuicTime::Delta::FromMicroseconds(timeout_us);
   while (stream_ != nullptr &&
          !client_->session()->IsClosedStream(stream_->id()) &&
          stream_->stream_bytes_read() == 0 &&