Shadow DOM: Use the empty InputTypeView implementation when input type is changed after author ShadowRoot was added.

For example, input[type=range] with an author ShadowRoot should not respond to
cursor key input.

BUG=274205
TEST=automated

Review URL: https://chromiumcodereview.appspot.com/23751006

git-svn-id: svn://svn.chromium.org/blink/trunk@157589 bbb929c8-8fbe-4397-9dbb-9b2b20218538