Change to calculate the real NTP in TimeTicks.

media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc

Index: media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc
diff --git a/media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc b/media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc
index 34ba266a288309e17fc0db90bc34888da652e411..7764b33305d084af42ee03c7f97c749d194d5608 100644
--- a/media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc
+++ b/media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_unittest.cc
@@ -26,7 +26,6 @@ static const int kSsrc = 0x12345;
 static const unsigned int kFrameSize = 5000;
 static const int kTotalHeaderLength = 19;
 static const int kMaxPacketStorageTimeMs = 300;
-static const int64 kStartMillisecond = 0;
 
 class TestRtpPacketTransport : public PacedPacketSender {
  public:
@@ -111,8 +110,6 @@ class RtpPacketizerTest : public ::testing::Test {
     config_.payload_type = kPayload;
     config_.max_payload_length = kMaxPacketLength;
     transport_.reset(new TestRtpPacketTransport(config_));
-    testing_clock_.Advance(
-        base::TimeDelta::FromMilliseconds(kStartMillisecond));
     rtp_packetizer_.reset(
         new RtpPacketizer(transport_.get(), &packet_storage_, config_));
   }