[Refactor] Always pass in screen coordinates to UIControlsAura::SendMouseMove()

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/162943004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251900 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251900