Bug webkit.org/b/112052: A positioned block with auto width should resize when moved left or right. There should be no horizontal scrollbars below.

Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah Blah blah blah blah