This method uses in messages.js in GetSourceLine and GetPositionInLine. This methods uses in v8::Message API methods and there is no documentation about it.
Method looks obsolete.
One of the strange side effect is shown by attached issue.

BUG=chromium:468781
R=yangguo@chromium.org
LOG=Y

Review URL: https://codereview.chromium.org/1022333004

Cr-Commit-Position: refs/heads/master@{#27374}