Make the execCommand() userInterface argument explicitly do nothing

There was no observable difference between CommandFromDOM and
CommandFromDOMWithUserInterface, so keep only CommandFromDOM.

A spec bug has been filed to match this:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=27533

Review URL: https://codereview.chromium.org/769053004

git-svn-id: svn://svn.chromium.org/blink/trunk@186834 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: 437bd043c1e5612ea08ccd1fa0bf9233d9ad809a
  1. third_party/