Back out one mistaken NDB upgrade detail.  The item is a PatchSet and item.issue is already a ndb.Key that references the issue so there is no need to use .key.
Back out one mistaken NDB upgrade detail.  The item is a PatchSet
and item.issue is already a ndb.Key that references the issue
so there is no need to use .key.

This change was mistakenly added on to a merge of code that had
already been reviewed, so removing it just gets back to accurately
matching the version that was LGTM'd.

ericmckean/rietveld,google-code-export/rietveld,Koulio/rietveld,arg0/rietveld,openlabs/cr.openlabs.co.in,andyzsf/rietveld,berkus/rietveld,robfig/rietveld,rietveld-codereview/rietveld,gavioto/rietveld,sajingeo/rietveld,arg0/rietveld,robfig/rietveld,supriyantomaftuh/rietveld,sajingeo/rietveld,v3ss0n/rietveld,gco/rietveld,salomon1184/rietveld,DeanHere/rietveld,gavioto/rietveld,foolonhill/rietveld,fuzan/rietveld,openlabs/cr.openlabs.co.in,google-code-export/rietveld,v3ss0n/rietveld,openlabs/cr.openlabs.co.in,berkus/rietveld,aungzanbaw/rietveld,DeanHere/rietveld,foolonhill/rietveld,google-code-export/rietveld,fuzan/rietveld,foolonhill/rietveld,v3ss0n/rietveld,robfig/rietveld,gco/rietveld,xtypebee/rietveld,dushmis/rietveld,rietveld-codereview/rietveld,draem0507/rietveld,fuzan/rietveld,rietveld-codereview/rietveld,andyzsf/rietveld,draem0507/rietveld,aungzanbaw/rietveld,arg0/rietveld,supriyantomaftuh/rietveld,Koulio/rietveld,gavioto/rietveld,xtypebee/rietveld,xtypebee/rietveld,dushmis/rietveld,sajingeo/rietveld,ericmckean/rietveld,ericmckean/rietveld,andyzsf/rietveld,Koulio/rietveld,berkus/rietveld,supriyantomaftuh/rietveld,salomon1184/rietveld,aungzanbaw/rietveld,gco/rietveld,rietveld-codereview/rietveld,draem0507/rietveld,DeanHere/rietveld,salomon1184/rietveld,dushmis/rietveld