IndexedDB: Re-enable structured-clone test

IndexedDB: Re-enable structured-clone test
https://bugs.webkit.org/show_bug.cgi?id=77239

This test was landed disabled, since it was failing. Turns out Date serialization
differs ("PST" vs. "Pacific Standard Time") across machines, so debug statements
in the test were removed.

Reviewed by Tony Chang.

* platform/chromium/test_expectations.txt:
* storage/indexeddb/structured-clone-expected.txt:
* storage/indexeddb/structured-clone.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106405 268f45cc-cd09-0410-ab3c-d52691b4dbfc