Set the start bitrate to the delay-based BWE.

webrtc/modules/congestion_controller/congestion_controller_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 222 matching lines @@
   for (int i = 0; i < 10; ++i) {
     clock_.AdvanceTimeMilliseconds((1000 * payload_size) / kInitialBitrateBps);
     int64_t now_ms = clock_.TimeInMilliseconds();
     header.extension.absoluteSendTime = AbsSendTime(now_ms, 1000);
     controller_->OnReceivedPacket(now_ms, payload_size, header);
   }
 
   ASSERT_EQ(1u, ssrcs.size());
   EXPECT_EQ(header.ssrc, ssrcs[0]);
 }
-
 }  // namespace test
 }  // namespace webrtc