This trades off more virtual calls in URLParams::ParseInput, while removing any extra
allocation when calling URLParams::Parse.
MozReview-Commit-ID: HrIqsguQjrk
--HG--
extra : rebase_source : fd6d4f0455f5c3df72bd3518b98359ac8759a89d
A web page could generate an URL by URl.createObjectURL(new Blob(...));
then navigate to this generated URL.
In this case the (top-level) document URI will be blob:{origin}:{uuid}.
And we try to add firstPartyDomain on this top-level document with blob URI, so
the following request from this document could have correct origin
attributes.