Use overloaded operators with QuicTime for addition, subtraction and scalar

net/tools/quic/quic_epoll_clock.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_epoll_clock.h"
 
 #include "net/tools/epoll_server/epoll_server.h"
 
 namespace net {
 
 QuicEpollClock::QuicEpollClock(EpollServer* epoll_server)
     : epoll_server_(epoll_server) {}
 
 QuicEpollClock::~QuicEpollClock() {}
 
 QuicTime QuicEpollClock::ApproximateNow() const {
-  return QuicTime::Zero().Add(
-      QuicTime::Delta::FromMicroseconds(epoll_server_->ApproximateNowInUsec()));
+  return QuicTime::Zero() + QuicTime::Delta::FromMicroseconds(
+                                epoll_server_->ApproximateNowInUsec());
 }
 
 QuicTime QuicEpollClock::Now() const {
-  return QuicTime::Zero().Add(
-      QuicTime::Delta::FromMicroseconds(epoll_server_->NowInUsec()));
+  return QuicTime::Zero() +
+         QuicTime::Delta::FromMicroseconds(epoll_server_->NowInUsec());
 }
 
 QuicWallTime QuicEpollClock::WallNow() const {
   return QuicWallTime::FromUNIXMicroseconds(
       epoll_server_->ApproximateNowInUsec());
 }
 
 QuicTime QuicEpollClock::ConvertWallTimeToQuicTime(
     const QuicWallTime& walltime) const {
-  return QuicTime::Zero().Add(
-      QuicTime::Delta::FromMicroseconds(walltime.ToUNIXMicroseconds()));
-};
+  return QuicTime::Zero() +
+         QuicTime::Delta::FromMicroseconds(walltime.ToUNIXMicroseconds());
+}
 
 }  // namespace net