DevTools: Revert stepping over/out on a selected call frame.

BUG=296963
R=pfeldman,vsevik,yurys

Review URL: https://codereview.chromium.org/26840004

git-svn-id: svn://svn.chromium.org/blink/trunk@159443 bbb929c8-8fbe-4397-9dbb-9b2b20218538