Value set in onblur should not keep element in focus

Value set in onblur was resulting in element still in focus due to reset
of the layout called on setValue. This patch fixes on reset of layout to remove
focus.

R=tkent, keishi1
BUG=347684
TEST=Background color differ when on blur value is set.

Review URL: https://codereview.chromium.org/191293011

git-svn-id: svn://svn.chromium.org/blink/trunk@170441 bbb929c8-8fbe-4397-9dbb-9b2b20218538