Test field trial group with startswith rather than equals.

webrtc/test/rtp_rtcp_observer.h

Index: webrtc/test/rtp_rtcp_observer.h
diff --git a/webrtc/test/rtp_rtcp_observer.h b/webrtc/test/rtp_rtcp_observer.h
index 4856de790587af3a2b7dced69e933ce40109d521..f3c95a64cd02024c4605460b923b273b5d74ff14 100644
--- a/webrtc/test/rtp_rtcp_observer.h
+++ b/webrtc/test/rtp_rtcp_observer.h
@@ -43,7 +43,7 @@ class RtpRtcpObserver {
   virtual ~RtpRtcpObserver() {}
 
   virtual bool Wait() {
-    if (field_trial::FindFullName("WebRTC-QuickPerfTest") == "Enabled") {
+    if (field_trial::IsEnabled("WebRTC-QuickPerfTest")) {
       observation_complete_.Wait(kShortTimeoutMs);
       return true;
     }