Use overloaded operators with QuicTime for addition, subtraction and scalar

net/tools/quic/quic_epoll_clock_test.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/quic/test_tools/mock_epoll_server.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace net {
 namespace test {
 
 TEST(QuicEpollClockTest, ApproximateNowInUsec) {
   MockEpollServer epoll_server;
   QuicEpollClock clock(&epoll_server);
 
   epoll_server.set_now_in_usec(1000000);
   EXPECT_EQ(1000000,
-            clock.ApproximateNow().Subtract(QuicTime::Zero()).ToMicroseconds());
+            (clock.ApproximateNow() - QuicTime::Zero()).ToMicroseconds());
   EXPECT_EQ(1u, clock.WallNow().ToUNIXSeconds());
   EXPECT_EQ(1000000u, clock.WallNow().ToUNIXMicroseconds());
 
   epoll_server.AdvanceBy(5);
   EXPECT_EQ(1000005,
-            clock.ApproximateNow().Subtract(QuicTime::Zero()).ToMicroseconds());
+            (clock.ApproximateNow() - QuicTime::Zero()).ToMicroseconds());
   EXPECT_EQ(1u, clock.WallNow().ToUNIXSeconds());
   EXPECT_EQ(1000005u, clock.WallNow().ToUNIXMicroseconds());
 
   epoll_server.AdvanceBy(10 * 1000000);
   EXPECT_EQ(11u, clock.WallNow().ToUNIXSeconds());
   EXPECT_EQ(11000005u, clock.WallNow().ToUNIXMicroseconds());
 }
 
 TEST(QuicEpollClockTest, NowInUsec) {
   MockEpollServer epoll_server;
   QuicEpollClock clock(&epoll_server);
 
   epoll_server.set_now_in_usec(1000000);
-  EXPECT_EQ(1000000, clock.Now().Subtract(QuicTime::Zero()).ToMicroseconds());
+  EXPECT_EQ(1000000, (clock.Now() - QuicTime::Zero()).ToMicroseconds());
 
   epoll_server.AdvanceBy(5);
-  EXPECT_EQ(1000005, clock.Now().Subtract(QuicTime::Zero()).ToMicroseconds());
+  EXPECT_EQ(1000005, (clock.Now() - QuicTime::Zero()).ToMicroseconds());
 }
 
 }  // namespace test
 }  // namespace net