Remove unused ScopedFakeClock from packet_router_unittest

This was unused for these tests and passes without it.

Bug: webrtc:42223992
Change-Id: Id19b1d7886a0527d49c2f4c30b947b486a6a6964
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/457581
Reviewed-by: Erik Språng <sprang@webrtc.org>
Auto-Submit: Evan Shrubsole <eshr@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47205}

modules/pacing/packet_router_unittest.cc

diff --git a/modules/pacing/packet_router_unittest.cc b/modules/pacing/packet_router_unittest.cc
index ee85329..d0143c2 100644
--- a/modules/pacing/packet_router_unittest.cc
+++ b/modules/pacing/packet_router_unittest.cc
@@ -20,7 +20,6 @@
 #include "api/rtp_headers.h"
 #include "api/transport/network_types.h"
 #include "api/units/data_size.h"
-#include "api/units/time_delta.h"
 #include "modules/rtp_rtcp/include/rtp_header_extension_map.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "modules/rtp_rtcp/mocks/mock_rtp_rtcp.h"
@@ -29,7 +28,6 @@
 #include "modules/rtp_rtcp/source/rtp_header_extensions.h"
 #include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
 #include "rtc_base/checks.h"
-#include "rtc_base/fake_clock.h"
 #include "test/gmock.h"
 #include "test/gtest.h"
 
@@ -676,7 +674,6 @@
 }
 
 TEST(PacketRouterRembTest, ChangeSendRtpModuleChangeRembSender) {
-  ScopedFakeClock clock;
   NiceMock<MockRtpRtcpInterface> rtp_send;
   NiceMock<MockRtpRtcpInterface> rtp_recv;
   PacketRouter packet_router;
@@ -701,7 +698,6 @@
 // Only register receiving modules and make sure we fallback to trigger a REMB
 // packet on this one.
 TEST(PacketRouterRembTest, NoSendingRtpModule) {
-  ScopedFakeClock clock;
   NiceMock<MockRtpRtcpInterface> rtp;
   PacketRouter packet_router;
 
@@ -722,7 +718,6 @@
 }
 
 TEST(PacketRouterRembTest, NonCandidateSendRtpModuleNotUsedForRemb) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> module;
 
@@ -740,7 +735,6 @@
 }
 
 TEST(PacketRouterRembTest, CandidateSendRtpModuleUsedForRemb) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> module;
 
@@ -758,7 +752,6 @@
 }
 
 TEST(PacketRouterRembTest, NonCandidateReceiveRtpModuleNotUsedForRemb) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> module;
 
@@ -776,7 +769,6 @@
 }
 
 TEST(PacketRouterRembTest, CandidateReceiveRtpModuleUsedForRemb) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> module;
 
@@ -795,7 +787,6 @@
 
 TEST(PacketRouterRembTest,
      SendCandidatePreferredOverReceiveCandidate_SendModuleAddedFirst) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> send_module;
   NiceMock<MockRtpRtcpInterface> receive_module;
@@ -822,7 +813,6 @@
 
 TEST(PacketRouterRembTest,
      SendCandidatePreferredOverReceiveCandidate_ReceiveModuleAddedFirst) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> send_module;
   NiceMock<MockRtpRtcpInterface> receive_module;
@@ -840,7 +830,6 @@
   EXPECT_CALL(send_module, SetRemb(bitrate_estimate, ssrcs));
   EXPECT_CALL(receive_module, SetRemb(_, _)).Times(0);
 
-  clock.AdvanceTime(TimeDelta::Millis(1000));
   packet_router.SendRemb(bitrate_estimate, ssrcs);
 
   // Test tear-down
@@ -849,7 +838,6 @@
 }
 
 TEST(PacketRouterRembTest, ReceiveModuleTakesOverWhenLastSendModuleRemoved) {
-  ScopedFakeClock clock;
   PacketRouter packet_router;
   NiceMock<MockRtpRtcpInterface> send_module;
   NiceMock<MockRtpRtcpInterface> receive_module;