Settings: Home page url remains even after deleting the url.
The bug is a regression by r209817.
HomePageOverlay assumes a 'change' event is dispatched when 'OK'
button is pressed. 'blur' event for a URL field, which triggers a
'change' event, has never been dispatched since r209817. This CL
corrects the behavior so that mousedown on buttons remove focus of
another form control.
BUG=258345
R=arv@chromium.org
Review URL: https://codereview.chromium.org/
18603015
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@211231 0039d316-1c4b-4281-b951-d872f2087c98