DevTools: Fix framework blackboxing for exceptions thrown inside V8 internal scripts.

BUG=267592
R=yurys

Review URL: https://codereview.chromium.org/443943002

git-svn-id: svn://svn.chromium.org/blink/trunk@179616 bbb929c8-8fbe-4397-9dbb-9b2b20218538