Revert 252669 "Revert 248648 "Cache feedback reports to disk in ..."

> Revert 248648 "Cache feedback reports to disk in case of send fa..."
> 
> BUG=345805
> 
> > Cache feedback reports to disk in case of send failure.
> > 
> > R=zork@chromium.org
> > BUG=249853
> > 
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=246992
> > 
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=247772
> > 
> > Review URL: https://codereview.chromium.org/141433011
> 
> TBR=rkc@chromium.org
> 
> Review URL: https://codereview.chromium.org/174313005

TBR=vitalybuka@chromium.org

Review URL: https://codereview.chromium.org/181943004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254249 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254249