Move destroy-reentry.html to TestExpectations instead of FlakyTests

This test no longer only fails on Mac Release bots, but is now also showing
flaky results on other bots (10.7 release is the only consistent bot). From
a correctness point of view, it looks like it's now randomly passing instead
of consistently failing?

TBR=jchaffraix@chromium.org
BUG=380167
NOTRY=true

Review URL: https://codereview.chromium.org/312693005

git-svn-id: svn://svn.chromium.org/blink/trunk@175367 bbb929c8-8fbe-4397-9dbb-9b2b20218538