DevTools: Eval results from accessors placeholder in preview should render as preview.

The object's placeholder results in console preview should render as preview,
but not (expandable) remote object.

BUG=175898
R=pfeldman,vsevik

Review URL: https://codereview.chromium.org/32643002

git-svn-id: svn://svn.chromium.org/blink/trunk@160345 bbb929c8-8fbe-4397-9dbb-9b2b20218538