Mark fast/images/destroyed-image-load-event.html as flaky also in release mode
Mark fast/images/destroyed-image-load-event.html as flaky also in release mode

TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/15682003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150988 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