Repro for crbug.com/1133307

This tests that DevTools properly sets breakpoints on startup.

Steps

1. Open DevTools
2. Set a breakpoint in crbug-1133307.js on line 1
3. Open a new tab (optionally closing this tab) and open DevTools
4. Navigate to this page in the new tab
5. DevTools should pause on the breakpoint in crbug-1133307.js