Remove GetFeedbackInterval in sender side BWE.

webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc

Index: webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
diff --git a/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc b/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
index 9aafc7b51607d551b982384761c616a5ca25c4a4..9500e27c5be756c1e096e917a1ad92976bb77dcc 100644
--- a/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
+++ b/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
@@ -408,7 +408,7 @@ void DelayBasedBweTest::CapacityDropTestHelper(
   uint32_t bitrate_bps = SteadyStateRun(
       kDefaultSsrc, steady_state_time * kFramerate, kStartBitrate,
       kMinExpectedBitrate, kMaxExpectedBitrate, kInitialCapacityBps);
-  EXPECT_NEAR(kInitialCapacityBps, bitrate_bps, 130000u);
+  EXPECT_NEAR(kInitialCapacityBps, bitrate_bps, 150000u);
   bitrate_observer_.Reset();
 
   // Add an offset to make sure the BWE can handle it.