Remove self-assignment in a test.
Remove self-assignment in a test.

BUG=skia:

Review URL: https://codereview.chromium.org/853723002

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