Fix quick perf test setting that was accidentally inverted.

Bug was introduced in
https://codereview.webrtc.org/2717973005/
Only affects test output, so omitting bug.

BUG=None

Review-Url: https://codereview.webrtc.org/2723093002
Cr-Original-Commit-Position: refs/heads/master@{#16943}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: e5d3a3ea78fde6f1557bdc5db3c457735d11b0b1
diff --git a/call/call_perf_tests.cc b/call/call_perf_tests.cc
index a510483..1551cd7 100644
--- a/call/call_perf_tests.cc
+++ b/call/call_perf_tests.cc
@@ -290,7 +290,7 @@
   observer.PrintResults();
 
   // In quick test synchronization may not be achieved in time.
-  if (field_trial::IsEnabled("WebRTC-QuickPerfTest")) {
+  if (!field_trial::IsEnabled("WebRTC-QuickPerfTest")) {
     EXPECT_EQ(1, metrics::NumSamples("WebRTC.Video.AVSyncOffsetInMs"));
   }
 }