Reimplemeted "Test and fix for huge bwe drop after alr state"

webrtc/modules/pacing/paced_sender.h

Index: webrtc/modules/pacing/paced_sender.h
diff --git a/webrtc/modules/pacing/paced_sender.h b/webrtc/modules/pacing/paced_sender.h
index 1d38d0956d09c968f7649dca237874d84fb8fa58..0fdab1fccc0b7fedb1774ba91ac4674710244d4b 100644
--- a/webrtc/modules/pacing/paced_sender.h
+++ b/webrtc/modules/pacing/paced_sender.h
@@ -127,12 +127,6 @@ class PacedSender : public Module, public RtpPacketSender {
   // packets in the queue, given the current size and bitrate, ignoring prio.
   virtual int64_t ExpectedQueueTimeMs() const;
 
-  // Returns time in milliseconds when the current application-limited region
-  // started or empty result if the sender is currently not application-limited.
-  //
-  // Application Limited Region (ALR) refers to operating in a state where the
-  // traffic on network is limited due to application not having enough
-  // traffic to meet the current channel capacity.
   virtual rtc::Optional<int64_t> GetApplicationLimitedRegionStartTime() const;
 
   // Returns the average time since being enqueued, in milliseconds, for all