Add textfield internal padding from FocusableBorder.
Add 3px of internal padding for textfield/combobox content.
Remove corresponding unused padding from FocusableBorder.
This better accommodates excessively tall fallback font text.
Update Omnibox, Find Bar, App List, and CookieInfoView.
See before/after pics at http://crbug.com/404999#c51
BUG=404999
TEST=Bookmark bubble/dialog, find bar, etc. don't clip most tall fallback text.
R=sky@chromium.org,pkasting@chromium.org
Review URL: https://codereview.chromium.org/
516943003
Cr-Commit-Position: refs/heads/master@{#294016}