Crash test case:
1. Open page with javascript
2. Add breakpoint
3. Stop on breakpoint
4. Use live edit and save script
The test worked for Chromium revision until May 30.

Review URL: https://codereview.chromium.org/329533002

git-svn-id: svn://svn.chromium.org/blink/trunk@176101 bbb929c8-8fbe-4397-9dbb-9b2b20218538