[chromium] Prune unnecessary failure expectations.

[chromium] Prune unnecessary failure expectations.
http://code.google.com/p/chromium/issues/detail?id=23489
http://code.google.com/p/chromium/issues/detail?id=67540
http://code.google.com/p/chromium/issues/detail?id=68436
http://code.google.com/p/chromium/issues/detail?id=77706
https://bugs.webkit.org/show_bug.cgi?id=47949
https://bugs.webkit.org/show_bug.cgi?id=65462
https://bugs.webkit.org/show_bug.cgi?id=68436
https://bugs.webkit.org/show_bug.cgi?id=73838
https://bugs.webkit.org/show_bug.cgi?id=74694
https://bugs.webkit.org/show_bug.cgi?id=83185

Unreviewed, test expectations update.

* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117530 268f45cc-cd09-0410-ab3c-d52691b4dbfc