DevTools: Crash fix.
DevTools: Crash fix.

BUG=384556
R=yurys

Review URL: https://codereview.chromium.org/347463006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@176418 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs