Turning off filter search for now to improve encode speed.
Turning off filter search for now to improve encode speed.

Change-Id: I87291fb40c745f34c36b067f47abdf69774a812f

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atra999/webm.libvpx,luctrudeau/aom,ittiamvpx/libvpx-1,sanyaade-teachings/libvpx,kim42083/webm.libvpx,kim42083/webm.libvpx,shyamalschandra/libvpx,iniwf/webm.libvpx,ittiamvpx/libvpx,matanbs/webm.libvpx,kleopatra999/webm.libvpx,felipebetancur/libvpx,shacklettbp/aom,mwgoldsmith/vpx,mbebenita/aom,altogother/webm.libvpx,Laknot/libvpx,n4t/libvpx,Suvarna1488/webm.libvpx,webmproject/libvpx,Acidburn0zzz/webm.libvpx,shyamalschandra/libvpx,smarter/aom,n4t/libvpx,mwgoldsmith/vpx,gshORTON/webm.libvpx,VTCSecureLLC/libvpx,n4t/libvpx,jmvalin/aom,vasilvv/esvp8,vasilvv/esvp8,liqianggao/libvpx,ShiftMediaProject/libvpx,altogother/webm.libvpx,cinema6/libvpx,liqianggao/libvpx,luctrudeau/aom,GrokImageCompression/aom,thdav/aom,running770/libvpx,mwgoldsmith/libvpx,liqianggao/libvpx,jmvalin/aom,kleopatra999/webm.libvpx,Acidburn0zzz/webm.libvpx,matanbs/webm.libvpx,mbebenita/aom,hsueceumd/test_hui,mwgoldsmith/libvpx,pcwalton/libvpx