DevTools: handle call frames with unresolved script sources upon exception break.
DevTools: handle call frames with unresolved script sources upon exception break.

Review URL: http://codereview.chromium.org/149329

git-svn-id: http://src.chromium.org/svn/trunk/src@20147 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c948e42699d98b42b485a1871df57365416df8c0
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser