Move BWE period calculation from ProbingIntervalEstimator to AimdRateControl.

webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h

Index: webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
diff --git a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
index 5a0a34584f7520c60ce4d4797ae33b5595d9d3af..6aa2338e004d25f8638f90814e319ba79f9ba5b7 100644
--- a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
+++ b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
@@ -24,7 +24,7 @@ namespace webrtc {
 class AimdRateControl {
  public:
   AimdRateControl();
-  virtual ~AimdRateControl();
+  ~AimdRateControl();
 
   // Returns true if there is a valid estimate of the incoming bitrate, false
   // otherwise.
@@ -43,11 +43,10 @@ class AimdRateControl {
   uint32_t Update(const RateControlInput* input, int64_t now_ms);
   void SetEstimate(int bitrate_bps, int64_t now_ms);
 
-  // Returns the increase rate which is used when used bandwidth is near the
-  // maximal available bandwidth.
-  virtual int GetNearMaxIncreaseRateBps() const;
-
-  virtual rtc::Optional<int> GetLastBitrateDecreaseBps() const;
+  // Returns the increase rate when used bandwidth is near the link capacity.
+  int GetNearMaxIncreaseRateBps() const;
+  // Returns the expected time between overuse signals (assuming steady state).
+  int GetExpectedBandwidthPeriodMs() const;
 
  private:
   // Update the target bitrate according based on, among other things,