Test field trial group with startswith rather than equals.

webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.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 33 matching lines @@
 }
 
 void BitrateController::MakeDecision(
     AudioNetworkAdaptor::EncoderRuntimeConfig* config) {
   // Decision on |bitrate_bps| should not have been made.
   RTC_DCHECK(!config->bitrate_bps);
   if (target_audio_bitrate_bps_ && overhead_bytes_per_packet_) {
     // Current implementation of BitrateController can only work when
     // |metrics.target_audio_bitrate_bps| includes overhead is enabled. This is
     // currently governed by the following field trial.
-    RTC_DCHECK_EQ("Enabled", webrtc::field_trial::FindFullName(
-                                 "WebRTC-SendSideBwe-WithOverhead"));
+    RTC_DCHECK(
+        webrtc::field_trial::IsEnabled("WebRTC-SendSideBwe-WithOverhead"));
     if (config->frame_length_ms)
       frame_length_ms_ = *config->frame_length_ms;
     int overhead_rate_bps =
         *overhead_bytes_per_packet_ * 8 * 1000 / frame_length_ms_;
     bitrate_bps_ = std::max(0, *target_audio_bitrate_bps_ - overhead_rate_bps);
   }
   config->bitrate_bps = rtc::Optional<int>(bitrate_bps_);
 }
 
 }  // namespace audio_network_adaptor
 }  // namespace webrtc