Remove handling for WEBP_HINT_GRAPH
Remove handling for WEBP_HINT_GRAPH

Remove handling for WEBP_HINT_GRAPH w.r.t use_palette flag.

The WEBP_HINT_GRAPH is now used at one place, to set the initial size of the
Bit Writer as bpp for photo images are generally larger than the graphical
images.

Change-Id: I1b9c4436c85a8f69da74c0dbcd292397323f2696

ericmckean/webm.libwebp,imazen/libwebp,kim42083/webm.libwebp,rxl194/libwebp,abwiz0086/webm.libwebp,ya7lelkom/libwebp,imazen/libwebp,jiehu5114/libwebp,PKRoma/libwebp,redengineer/libwebp,gshORTON/webm.libwebp,rxl194/libwebp,ericmckean/webm.libwebp,comoyo/gonzo-libwebp,comoyo/gonzo-libwebp,yohunl/libwebp,Maria1099/webm.libwebp,kalli123/webm.libwebp,Suvarna1488/webm.libwebp,Suvarna1488/webm.libwebp,kleopatra999/webm.libwebp,redengineer/libwebp,comoyo/gonzo-libwebp,altogother/webm.libwebp,Aexyn/libwebp,rxl194/libwebp,webmproject/libwebp,kim42083/webm.libwebp,kalli123/webm.libwebp,zofuthan/libwebp,ericmckean/webm.libwebp,jiehu5114/libwebp,kim42083/webm.libwebp,iniwf/webm.libwebp,ya7lelkom/libwebp,Suvarna1488/webm.libwebp,PKRoma/libwebp,matanbs/webm.libwebp,reimaginemedia/webm.libwebp,Acidburn0zzz/webm.libwebp,kleopatra999/webm.libwebp,Suvarna1488/webm.libwebp,Acidburn0zzz/webm.libwebp,yohunl/libwebp,Aexyn/libwebp,Aexyn/libwebp,jiehu5114/libwebp,comoyo/gonzo-libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,comoyo/gonzo-libwebp,ttyangf/libwebp,redengineer/libwebp,kalli123/webm.libwebp,matanbs/webm.libwebp,imazen/libwebp,matanbs/webm.libwebp,ya7lelkom/libwebp,zofuthan/libwebp,ericmckean/webm.libwebp,PKRoma/libwebp,abwiz0086/webm.libwebp,comoyo/gonzo-libwebp,altogother/webm.libwebp,jacklicn/libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,ttyangf/libwebp,yohunl/libwebp,redengineer/libwebp,Acidburn0zzz/webm.libwebp,ya7lelkom/libwebp,jacklicn/libwebp,PKRoma/libwebp,altogother/webm.libwebp,zofuthan/libwebp,altogother/webm.libwebp,PKRoma/libwebp,Maria1099/webm.libwebp,yohunl/libwebp,webmproject/libwebp,redengineer/libwebp,kalli123/webm.libwebp,reimaginemedia/webm.libwebp,abwiz0086/webm.libwebp,imazen/libwebp,ttyangf/libwebp,gshORTON/webm.libwebp,Aexyn/libwebp,matanbs/webm.libwebp,ya7lelkom/libwebp,Maria1099/webm.libwebp,jiehu5114/libwebp,gshORTON/webm.libwebp,altogother/webm.libwebp,kleopatra999/webm.libwebp,Aexyn/libwebp,ttyangf/libwebp,abwiz0086/webm.libwebp,Acidburn0zzz/webm.libwebp,iniwf/webm.libwebp,rxl194/libwebp,zofuthan/libwebp,kim42083/webm.libwebp,jacklicn/libwebp,kalli123/webm.libwebp,abwiz0086/webm.libwebp,comoyo/gonzo-libwebp,Maria1099/webm.libwebp,Acidburn0zzz/webm.libwebp,reimaginemedia/webm.libwebp,Maria1099/webm.libwebp,gshORTON/webm.libwebp,webmproject/libwebp,kim42083/webm.libwebp,webmproject/libwebp,ericmckean/webm.libwebp,webmproject/libwebp,iniwf/webm.libwebp,ttyangf/libwebp,zofuthan/libwebp,jiehu5114/libwebp,matanbs/webm.libwebp,reimaginemedia/webm.libwebp,iniwf/webm.libwebp,kleopatra999/webm.libwebp,yohunl/libwebp,Suvarna1488/webm.libwebp,rxl194/libwebp,iniwf/webm.libwebp,imazen/libwebp,PKRoma/libwebp,reimaginemedia/webm.libwebp