Remove SendPacer from ViEEncoder and make sure SendPacer starts at a valid bitrate

webrtc/modules/pacing/mock/mock_paced_sender.h

Index: webrtc/modules/pacing/mock/mock_paced_sender.h
diff --git a/webrtc/modules/pacing/mock/mock_paced_sender.h b/webrtc/modules/pacing/mock/mock_paced_sender.h
index c710dbcbea581736f68cc6a60aadda7e6d9ac3ca..bd7d7aaa499ff1fb91bbadd40f658b0c58080014 100644
--- a/webrtc/modules/pacing/mock/mock_paced_sender.h
+++ b/webrtc/modules/pacing/mock/mock_paced_sender.h
@@ -22,15 +22,17 @@ namespace webrtc {
 
 class MockPacedSender : public PacedSender {
  public:
-  MockPacedSender() : PacedSender(Clock::GetRealTimeClock(), NULL, 0, 0, 0) {}
+  MockPacedSender() : PacedSender(Clock::GetRealTimeClock(), nullptr) {}
   MOCK_METHOD6(SendPacket, bool(Priority priority,
                                 uint32_t ssrc,
                                 uint16_t sequence_number,
                                 int64_t capture_time_ms,
                                 size_t bytes,
                                 bool retransmission));
+  MOCK_METHOD1(SetEstimatedBitrate, void(uint32_t));
   MOCK_CONST_METHOD0(QueueInMs, int64_t());
   MOCK_CONST_METHOD0(QueueInPackets, int());
+  MOCK_CONST_METHOD0(ExpectedQueueTimeMs, int64_t());
 };
 
 }  // namespace webrtc