Remove RenderTextControlSingleLine::updateFromElement.

This virtual method merely calls its superclass method.

BUG=376805

Review URL: https://codereview.chromium.org/296933014

git-svn-id: svn://svn.chromium.org/blink/trunk@174745 bbb929c8-8fbe-4397-9dbb-9b2b20218538