Increase the threshold for CallPerfTest.CaptureNtpTimeWithNetworkDelay to avoid flaky.
Increase the threshold for CallPerfTest.CaptureNtpTimeWithNetworkDelay to avoid flaky.

BUG=3374
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/19529004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9aa7d8df95535aa681a637ffe56ffc7c7757868b

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc