Count input[type=text], input[type=text][maxlength], input[type=password], and input[type=password][maxlength].

They are needed to see if input[type=email][maxlength] usage is large or small.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=23573

BUG=none

Review URL: https://codereview.chromium.org/53853002

git-svn-id: svn://svn.chromium.org/blink/trunk@161009 bbb929c8-8fbe-4397-9dbb-9b2b20218538