DevTools: [Console] bring back per-word wrapping of console messages

The patch restores per-word wrapping of console messages. This was
regressed in r180833.

BUG=412515
R=pfeldman, vsevik

Review URL: https://codereview.chromium.org/542383004

git-svn-id: svn://svn.chromium.org/blink/trunk@181965 bbb929c8-8fbe-4397-9dbb-9b2b20218538