Suppress webtiming-buffer-full-no-event.html failures
Suppress webtiming-buffer-full-no-event.html failures

http/tests/misc/webtiming-buffer-full-no-event.html has been flaky for
some time:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=http%2Ftests%2Fmisc%2Fwebtiming-buffer-full-no-event.html

TBR=tkent
NOTRY=true
BUG=435232

Review URL: https://codereview.chromium.org/748483002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185690 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs