Revert 238715 "Reland 238671 "Added net::NetworkInterface::inter..."

Reverting r238671 yet again!
r238671 was originally reverted on r238707 and
was added back in on r238715 due to some confusion.

> Reland 238671 "Added net::NetworkInterface::interface_index."
> 
> net_unittests still failed after reverting the original CL, so
> it obviously wasn't the cause of the failures.
> 
> > Revert 238671 "Added net::NetworkInterface::interface_index."
> > 
> > Speculative revert to see if it fixes the issues with net_unittests
> > on WinXP: http://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%282%29/builds/32133/steps/net_unittests/logs/stdio
> > 
> > > Added net::NetworkInterface::interface_index.
> > > Not implemented for Android.
> > > 
> > > BUG=319068
> > > 
> > > Review URL: https://codereview.chromium.org/100703002
> > 
> > TBR=vitalybuka@chromium.org
> > 
> > Review URL: https://codereview.chromium.org/101403004
> 
> TBR=dubroy@chromium.org
> 
> Review URL: https://codereview.chromium.org/105053002

TBR=dubroy@chromium.org

Review URL: https://codereview.chromium.org/105393002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238739 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238739