Test field trial group with startswith rather than equals.

webrtc/video/video_send_stream.cc

 /*
  *  Copyright (c) 2013 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/video/video_send_stream.h"
@@ skipping 739 matching lines @@
     CongestionController* congestion_controller,
     PacketRouter* packet_router,
     BitrateAllocator* bitrate_allocator,
     SendDelayStats* send_delay_stats,
     VieRemb* remb,
     ViEEncoder* vie_encoder,
     RtcEventLog* event_log,
     const VideoSendStream::Config* config,
     int initial_encoder_max_bitrate,
     std::map<uint32_t, RtpState> suspended_ssrcs)
-    : send_side_bwe_with_overhead_(webrtc::field_trial::FindFullName(
-            "WebRTC-SendSideBwe-WithOverhead") == "Enabled"),
+    : send_side_bwe_with_overhead_(
+          webrtc::field_trial::IsEnabled("WebRTC-SendSideBwe-WithOverhead")),
       stats_proxy_(stats_proxy),
       config_(config),
       suspended_ssrcs_(std::move(suspended_ssrcs)),
       module_process_thread_(nullptr),
       worker_queue_(worker_queue),
       check_encoder_activity_task_(nullptr),
       call_stats_(call_stats),
       congestion_controller_(congestion_controller),
       packet_router_(packet_router),
       bitrate_allocator_(bitrate_allocator),
@@ skipping 563 matching lines @@
       std::min(config_->rtp.max_packet_size,
                kPathMTU - transport_overhead_bytes_per_packet_);
 
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_) {
     rtp_rtcp->SetMaxRtpPacketSize(rtp_packet_size);
   }
 }
 
 }  // namespace internal
 }  // namespace webrtc