Test field trial group with startswith rather than equals.

webrtc/modules/remote_bitrate_estimator/bwe_defines.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.
  */
 
 #include "webrtc/system_wrappers/include/field_trial.h"
 
 namespace webrtc {
 
 const char* kBweTypeHistogram = "WebRTC.BWE.Types";
 
 namespace congestion_controller {
 int GetMinBitrateBps() {
   constexpr int kAudioMinBitrateBps = 5000;
   constexpr int kMinBitrateBps = 10000;
-  if (webrtc::field_trial::FindFullName("WebRTC-Audio-SendSideBwe") ==
-      "Enabled") {
+  if (webrtc::field_trial::IsEnabled("WebRTC-Audio-SendSideBwe")) {
     return kAudioMinBitrateBps;
   }
   return kMinBitrateBps;
 }
 
 }  // namespace congestion_controller
 }  // namespace webrtc