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Chromium side of WebKit patch: https://bugs.webkit.org/show_bug.cgi?id=70065
This drops the Chromium dependency on WebIDBKey::NullType and treats it the
same as WebIDBKey::InvalidType. Once this has landed, the second half of
the WebKit side can go in and (finally) the default: cases herein ensuring
all enumeration parameters are handled can be removed.

BUG=98930
TEST=

Review URL: http://codereview.chromium.org/8276023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107744 0039d316-1c4b-4281-b951-d872f2087c98