Omnibox: Add DCHECK that default match for URL input is not a query

BUG=284781

Review URL: https://codereview.chromium.org/28873007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229972 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229972