Revert 233860 "Revert 233816 "Retry on low-level connection erro..."

> Revert 233816 "Retry on low-level connection errors and on HTTP ..."
> 
> BUG=316569
> 
> > Retry on low-level connection errors and on HTTP 503 errors in PrivetURLFetcher
> > 
> > To avoid connection reset issues on long file upload, retry on low-level
> > connection errors and HTTP 503 errors in PrivetURLFetcher.
> > 
> > BUG=
> > 
> > Review URL: https://codereview.chromium.org/62753004
> 
> TBR=noamsml@chromium.org
> 
> Review URL: https://codereview.chromium.org/66313006

TBR=serya@chromium.org

Review URL: https://codereview.chromium.org/67273003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234044 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234044