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This was accidentally re-added during a bad merge; having the type causes the new built-in validation to be activated, and it's stricter than we want to be.

BUG=None
TEST=Enter a domain without a scheme in the add page overlay field; there shouldn't be any validation UI

Review URL: http://codereview.chromium.org/6352020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72674 0039d316-1c4b-4281-b951-d872f2087c98