Revert 181627

Revert 181627
> Revert 181626
> > Revert 181569
> > > SPDY - Added back code that deleted read_pending_.
> > > 
> > > R=rch@chromium.org
> > > BUG=175069
> > > 
> > > Review URL: https://chromiumcodereview.appspot.com/12224078
> > 
> > TBR=rtenneti@chromium.org
> > Review URL: https://codereview.chromium.org/12208103
> 
> TBR=rtenneti@chromium.org
> Review URL: https://codereview.chromium.org/12212101

Reverting CL https://chromiumcodereview.appspot.com/12224078
because https://chromiumcodereview.appspot.com/12212102/
fixed the crash.

TBR=rtenneti@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=181660