Remove GetFeedbackInterval in sender side BWE.

webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc

Index: webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc
index f83cddc617862b56ca50131895e97921084178b2..03f0cf9c814e712d8818fc364a10eae621574ec5 100644
--- a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc
+++ b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.cc
@@ -22,9 +22,12 @@
 
 namespace webrtc {
 
-static const int64_t kDefaultRttMs = 200;
-static const double kWithinIncomingBitrateHysteresis = 1.05;
-static const int64_t kMaxFeedbackIntervalMs = 1000;
+namespace {
+constexpr int64_t kDefaultRttMs = 200;
+constexpr double kWithinIncomingBitrateHysteresis = 1.05;
+constexpr int64_t kMaxFeedbackIntervalMs = 1000;
+constexpr double kMinIncreaseBps = 250.0;
+}  // namespace
 
 AimdRateControl::AimdRateControl()
     : min_configured_bitrate_bps_(
@@ -229,8 +232,8 @@ uint32_t AimdRateControl::MultiplicativeRateIncrease(
                                              1000);
     alpha = pow(alpha,  time_since_last_update_ms / 1000.0);
   }
-  uint32_t multiplicative_increase_bps = std::max(
-      current_bitrate_bps * (alpha - 1.0), 1000.0);
+  uint32_t multiplicative_increase_bps =
+      std::max(current_bitrate_bps * (alpha - 1.0), kMinIncreaseBps);
   return multiplicative_increase_bps;
 }
 
@@ -247,8 +250,8 @@ uint32_t AimdRateControl::AdditiveRateIncrease(
   double bits_per_frame = static_cast<double>(current_bitrate_bps_) / 30.0;
   double packets_per_frame = std::ceil(bits_per_frame / (8.0 * 1200.0));
   double avg_packet_size_bits = bits_per_frame / packets_per_frame;
-  uint32_t additive_increase_bps = std::max(
-      1000.0, beta * avg_packet_size_bits);
+  uint32_t additive_increase_bps =
+      std::max(kMinIncreaseBps, beta * avg_packet_size_bits);
   return additive_increase_bps;
 }