Revert 240670 "Revert 239894 "Linux Sandbox: check no threads be..."

> Revert 239894 "Linux Sandbox: check no threads before fork()."
> 
> BUG=327241, 328249
> 
> > Linux Sandbox: check no threads before fork().
> > 
> > Always check that no threads are running before fork().
> > 
> > BUG=327241
> > NOTRY=true
> > 
> > Review URL: https://codereview.chromium.org/108173008
> 
> TBR=jln@chromium.org
> 
> Review URL: https://codereview.chromium.org/106903012

TBR=jln@chromium.org

Review URL: https://codereview.chromium.org/100623014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240961 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed