Rollback of "Use small BWE period when there is a true network degradation"

modules/congestion_controller/delay_based_bwe_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 121 matching lines @@
     send_time_ms += 1;
     now_ms = clock_.TimeInMilliseconds();
     IncomingFeedback(now_ms, send_time_ms, seq_num++, 1000, kPacingInfo1);
   }
 
   EXPECT_TRUE(bitrate_observer_.updated());
   EXPECT_NEAR(bitrate_observer_.latest_bitrate(),
               kTargetUtilizationFraction * 4000000u, 10000u);
 }
 
+TEST_F(DelayBasedBweTest, GetExpectedBwePeriodMs) {
+  int64_t default_interval_ms = bitrate_estimator_->GetExpectedBwePeriodMs();
+  EXPECT_GT(default_interval_ms, 0);
+  CapacityDropTestHelper(1, true, 333, 0);
+  int64_t interval_ms = bitrate_estimator_->GetExpectedBwePeriodMs();
+  EXPECT_GT(interval_ms, 0);
+  EXPECT_NE(interval_ms, default_interval_ms);
+}
+
 TEST_F(DelayBasedBweTest, InitialBehavior) {
   InitialBehaviorTestHelper(730000);
 }
 
 TEST_F(DelayBasedBweTest, RateIncreaseReordering) {
   RateIncreaseReorderingTestHelper(730000);
 }
 TEST_F(DelayBasedBweTest, RateIncreaseRtpTimestamps) {
   RateIncreaseRtpTimestampsTestHelper(627);
 }
@@ skipping 64 matching lines @@
     } else if (bitrate_observer_.updated()) {
       bitrate_bps = bitrate_observer_.latest_bitrate();
       bitrate_observer_.Reset();
     }
   }
   EXPECT_TRUE(seen_overuse);
   EXPECT_NEAR(bitrate_observer_.latest_bitrate(), kStartBitrate / 2, 15000);
 }
 
 }  // namespace webrtc