Chrome Version: 52.0.2743.24 Revision 334afe94883b731af3eacab708ac03ba796d5c5b-refs/branch-heads/2743@{#181}(32/64 bit)
OS: Windows(7,8,10), Linux (14.04 LTS),Mac(10.10.5, 10.11.4)

What steps will reproduce the problem?
(1) Launch chrome, switch to 'Guest' mode and open dev tools window.
(2) Press Ctrl+p and  select ".js" file, now right click,and select "Add source map" option.
(3) Enter text in it and click on 'Add' button, observe.

Browser gets crashed after clicking on 'Add' button.

Browser should never crash.

This is regression issue, broken in 'M-52', below is bisect info:

Good Build: 52.0.2721.0
Bad Build: 52.0.2722.0

Narrow Bisect:
https://chromium.googlesource.com/chromium/src/+log/13905ccd656349df4ec5e9bf196d4bc913a0a97b..dcdc0218d3404fb53a1b27f40b3ebed5dd5e277d?pretty=fuller&n=10

Suspecting: r390844

Note: For the above crash, crash id does not get generated.
 

Deleted: Actual_Devtools.mp4 944 KB

Actual_Devtools.mp4 944 KB Download

Deleted: Expected_Devtools.mp4 494 KB

Expected_Devtools.mp4 494 KB Download