Revert of Unflake inspector/sources/debugger/async-callstack-in-console.html (https://codereview.chromium.org/378293006/)

Reason for revert:
Crashing on Mac10.6 debug
See: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6%20(dbg)/builds/16239

Original issue's description:
> Unflake inspector/sources/debugger/async-callstack-in-console.html
> 
> BUG=392531
> TBR=yurys
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177807

TBR=yurys@chromium.org,aandrey@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=392531

Review URL: https://codereview.chromium.org/374353003

git-svn-id: svn://svn.chromium.org/blink/trunk@177840 bbb929c8-8fbe-4397-9dbb-9b2b20218538