Fix compiler warning in IDBTransaction::modeToString
https://bugs.webkit.org/show_bug.cgi?id=113547

Reviewed by Darin Adler.

Not all compilers are smart enough to handle this switch. This patch refactors
modeToString to not return from the default case.

No new tests as this is just a compiler fix.

* Modules/indexeddb/IDBTransaction.cpp:
(WebCore::IDBTransaction::modeToString):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147187 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed gardening.

http/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html
crashes sometimes. Applying the patch from wkbug.com/111902 fixes it
locally for me: skipping it until that patch lands.

* platform/mac/TestExpectations:
    Marking http/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html
    as crashy in Debug.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147188 268f45cc-cd09-0410-ab3c-d52691b4dbfc