Mark before-unload-return-bad-value as timing out on debug too.
Mark before-unload-return-bad-value as timing out on debug too.

This test has been observed timing out in debug builds as
well as release builds.
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6%20%28dbg%29/builds/16950

BUG=398306
TBR=haraken@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/454453002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@179735 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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