webaudio/realtimeanalyser-fft-scaling.html is flaky on all platforms.

BUG=392095
TBR=pilgrim@chromium.org,rtoy@chromium.org

Review URL: https://codereview.chromium.org/374863002

git-svn-id: svn://svn.chromium.org/blink/trunk@177650 bbb929c8-8fbe-4397-9dbb-9b2b20218538