Remove outdated comment in SkImageDecoder.h
Remove outdated comment in SkImageDecoder.h

The comment was no longer relevant with
https://codereview.chromium.org/483593002

Review URL: https://codereview.chromium.org/715673002

AOSPB/external_skia,rubenvb/skia,VRToxin-AOSP/android_external_skia,vanish87/skia,HalCanary/skia-hc,todotodoo/skia,amyvmiwei/skia,MarshedOut/android_external_skia,TeamExodus/external_skia,amyvmiwei/skia,AOSPB/external_skia,w3nd1go/android_external_skia,ominux/skia,samuelig/skia,TeamTwisted/external_skia,invisiblek/android_external_skia,MarshedOut/android_external_skia,OneRom/external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,pcwalton/skia,google/skia,OneRom/external_skia,MarshedOut/android_external_skia,rubenvb/skia,nvoron23/skia,YUPlayGodDev/platform_external_skia,timduru/platform-external-skia,OneRom/external_skia,jtg-gg/skia,shahrzadmn/skia,invisiblek/android_external_skia,HalCanary/skia-hc,scroggo/skia,Infinitive-OS/platform_external_skia,Infinitive-OS/platform_external_skia,amyvmiwei/skia,YUPlayGodDev/platform_external_skia,spezi77/android_external_skia,BrokenROM/external_skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,MonkeyZZZZ/platform_external_skia,TeamTwisted/external_skia,MinimalOS-AOSP/platform_external_skia,Igalia/skia,AOSP-YU/platform_external_skia,PAC-ROM/android_external_skia,geekboxzone/mmallow_external_skia,MarshedOut/android_external_skia,OneRom/external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,MinimalOS-AOSP/platform_external_skia,vanish87/skia,invisiblek/android_external_skia,todotodoo/skia,MonkeyZZZZ/platform_external_skia,Jichao/skia,noselhq/skia,tmpvar/skia.cc,MonkeyZZZZ/platform_external_skia,google/skia,MonkeyZZZZ/platform_external_skia,boulzordev/android_external_skia,amyvmiwei/skia,nfxosp/platform_external_skia,shahrzadmn/skia,Jichao/skia,ominux/skia,Hikari-no-Tenshi/android_external_skia,shahrzadmn/skia,rubenvb/skia,shahrzadmn/skia,AOSP-YU/platform_external_skia,TeamTwisted/external_skia,invisiblek/android_external_skia,vanish87/skia,Infinitive-OS/platform_external_skia,Igalia/skia,Jichao/skia,TeamExodus/external_skia,rubenvb/skia,todotodoo/skia,BrokenROM/external_skia,DiamondLovesYou/skia-sys,w3nd1go/android_external_skia,YUPlayGodDev/platform_external_skia,AOSPB/external_skia,nfxosp/platform_external_skia,vanish87/skia,google/skia,geekboxzone/mmallow_external_skia,qrealka/skia-hc,nvoron23/skia,geekboxzone/mmallow_external_skia,YUPlayGodDev/platform_external_skia,MonkeyZZZZ/platform_external_skia,TeamExodus/external_skia,BrokenROM/external_skia,PAC-ROM/android_external_skia,noselhq/skia,tmpvar/skia.cc,Jichao/skia,Hikari-no-Tenshi/android_external_skia,VRToxin-AOSP/android_external_skia,qrealka/skia-hc,boulzordev/android_external_skia,AOSPB/external_skia,boulzordev/android_external_skia,ominux/skia,tmpvar/skia.cc,chenlian2015/skia_from_google,chenlian2015/skia_from_google,pcwalton/skia,invisiblek/android_external_skia,noselhq/skia,MinimalOS-AOSP/platform_external_skia,todotodoo/skia,MonkeyZZZZ/platform_external_skia,boulzordev/android_external_skia,aosp-mirror/platform_external_skia,timduru/platform-external-skia,HalCanary/skia-hc,Infinitive-OS/platform_external_skia,jtg-gg/skia,samuelig/skia,samuelig/skia,w3nd1go/android_external_skia,Jichao/skia,rubenvb/skia,Infinitive-OS/platform_external_skia,TeamExodus/external_skia,AOSP-YU/platform_external_skia,chenlian2015/skia_from_google,pcwalton/skia,shahrzadmn/skia,aosp-mirror/platform_external_skia,AOSP-YU/platform_external_skia,samuelig/skia,HalCanary/skia-hc,qrealka/skia-hc,AOSPB/external_skia,geekboxzone/mmallow_external_skia,DiamondLovesYou/skia-sys,Igalia/skia,DiamondLovesYou/skia-sys,MarshedOut/android_external_skia,pcwalton/skia,Infinitive-OS/platform_external_skia,amyvmiwei/skia,tmpvar/skia.cc,UBERMALLOW/external_skia,noselhq/skia,PAC-ROM/android_external_skia,shahrzadmn/skia,VRToxin-AOSP/android_external_skia,todotodoo/skia,PAC-ROM/android_external_skia,timduru/platform-external-skia,spezi77/android_external_skia,w3nd1go/android_external_skia,MarshedOut/android_external_skia,HalCanary/skia-hc,ominux/skia,AOSPB/external_skia,VRToxin-AOSP/android_external_skia,UBERMALLOW/external_skia,vanish87/skia,ominux/skia,vanish87/skia,VRToxin-AOSP/android_external_skia,samuelig/skia,VRToxin-AOSP/android_external_skia,YUPlayGodDev/platform_external_skia,timduru/platform-external-skia,samuelig/skia,rubenvb/skia,Jichao/skia,noselhq/skia,UBERMALLOW/external_skia,vanish87/skia,scroggo/skia,PAC-ROM/android_external_skia,UBERMALLOW/external_skia,AOSPB/external_skia,AOSP-YU/platform_external_skia,BrokenROM/external_skia,YUPlayGodDev/platform_external_skia,tmpvar/skia.cc,spezi77/android_external_skia,aosp-mirror/platform_external_skia,PAC-ROM/android_external_skia,VRToxin-AOSP/android_external_skia,Jichao/skia,nfxosp/platform_external_skia,UBERMALLOW/external_skia,DiamondLovesYou/skia-sys,timduru/platform-external-skia,rubenvb/skia,chenlian2015/skia_from_google,Infinitive-OS/platform_external_skia,MinimalOS-AOSP/platform_external_skia,qrealka/skia-hc,AOSPB/external_skia,spezi77/android_external_skia,geekboxzone/mmallow_external_skia,TeamExodus/external_skia,am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