Added index for closed, owner, -created.
Added index for closed, owner, -created.

Review URL: https://codereview.appspot.com/122740043/

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