Test field trial group with startswith rather than equals.

webrtc/test/rtp_rtcp_observer.h

 /*
  *  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.
  */
 #ifndef WEBRTC_TEST_RTP_RTCP_OBSERVER_H_
@@ skipping 25 matching lines @@
 class RtpRtcpObserver {
  public:
   enum Action {
     SEND_PACKET,
     DROP_PACKET,
   };
 
   virtual ~RtpRtcpObserver() {}
 
   virtual bool Wait() {
-    if (field_trial::FindFullName("WebRTC-QuickPerfTest") == "Enabled") {
+    if (field_trial::IsEnabled("WebRTC-QuickPerfTest")) {
       observation_complete_.Wait(kShortTimeoutMs);
       return true;
     }
     return observation_complete_.Wait(timeout_ms_);
   }
 
   virtual Action OnSendRtp(const uint8_t* packet, size_t length) {
     return SEND_PACKET;
   }
 
@@ skipping 84 matching lines @@
     return true;  // Will never happen, makes compiler happy.
   }
 
   RtpRtcpObserver* const observer_;
   TransportType transport_type_;
 };
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_RTP_RTCP_OBSERVER_H_